Holy Goat Brewing: Dundee’s Mixed-Fermentation Sour Specialists — and How to Brew the Style at Home

Few UK breweries commit to slow, wild fermentation the way Holy Goat Brewing does. Based in Dundee, Scotland, the brewery has built its whole identity around Brettanomyces — the yeast most producers treat as a nuisance and Holy Goat treats as the point. The result is a house character of dryness, stone fruit and pineapple esters, faint leather and hay, and a tartness that comes from fermentation rather than from a jug of added acid.

This guide covers three things a UK drinker or homebrewer actually needs: what Holy Goat brews and how its method works, how to buy the bottles (the brewery’s web shop is the primary UK channel), and — because the real affiliate value in this category sits in yeast and kit choice — how to get somewhere near the style in your own brew shed, safely, without turning your bottles into glass grenades.

One clarification before anything else: this is Holy Goat Brewing, the Scottish brewery. It is entirely unrelated to the Australian goat-cheese producer that shares the name.

Quick Picks

Holy Goat Brewing at a Glance

• Based in: Dundee, Scotland
• Specialism: mixed-fermentation and wood-aged beer
• Signature method: fermentation built around Brettanomyces yeast, described by the brewery as an “unconventional approach to yeast and fermentation”
• Maturation: the brewery’s own stated figure is typically 3–4 months before release
• Philosophy: tradition-led experimentation with high-quality ingredients
• Where to buy: the brewery’s own web shop is the primary UK channel, with free UK mainland delivery above a threshold
• Community: active on Instagram and Twitter, plus an Untappd profile for checking how individual releases have landed

What we could and couldn’t verify

Desk research has limits, and this is a brewery with a deliberately thin web footprint, so it’s worth being straight about what is and isn’t confirmed.

Brewery founding details and the founder’s name are not confirmed by any named public source we could check. The same applies to visitor facilities: we could not confirm a taproom or opening-hours arrangement from a reliable named source, so treat any assumption that you can simply turn up and drink on site as unverified — check the brewery’s own site before travelling.

What is attributable to the brewery’s own copy is the method: mixed cultures, wood ageing, Brettanomyces at the centre of the process, and a maturation window of three to four months. Those are the claims this guide is built on.

Why “Goat”?

The name is a trade in-joke, and it’s the brewery’s own framing. “Goat-like” is long-standing tasting-note slang for the rustic, farmyard character that wild Brettanomyces can throw — specifically the phenolic compound 4-ethylphenol, which is the molecule behind band-aid, barnyard and horse-blanket descriptors. Where most breweries spend money trying to keep that note out of the beer, Holy Goat reveres it. The sign-off says it all: Hail the Goat.

How a Holy Goat Beer Is Actually Made

Brett alone does not make a beer sour

This is the single most useful thing to understand about the style, and it corrects a mistake nearly every newcomer makes.

Brettanomyces is a yeast, not a souring bacteria. It contributes funk and phenols — 4-ethylphenol and 4-ethylguaiacol being the two that matter most — plus fruity esters and, where oxygen is present, acetic acid. What it does not produce is lactic acid. Lactic acid, the clean, yoghurt-adjacent tartness that most drinkers mean when they say “sour”, comes from Lactobacillus and/or Pediococcus, two entirely different organisms.

So when the brewery describes its beers as using “mixed cultures”, that phrase is doing real work: a genuine mixed fermentation is a community of organisms, a yeast and at least one bacterium, each contributing a different piece of the finished flavour. A beer pitched with Brett alone will taste funky and dry — it will not taste sour in the lactic sense.

Wood does two jobs

Holy Goat describes its output as wood-aged as well as mixed-fermentation. Wood isn’t decoration in this style, and the mechanism matters:

1. It houses the culture. The pores of a barrel or foeder give Brettanomyces, Lactobacillus and Pediococcus somewhere to live between batches, which is how a brewery keeps a mixed-fermentation programme running for years rather than starting from a fresh pitch every time.
2. It lets oxygen in slowly. Wood is slightly permeable, so maturing beer picks up a slow, steady trickle of oxygen. That micro-oxidation softens harsh edges and feeds the acetic character Brett produces in the presence of O₂ — which is why over-oxygenated Brett beers tip into vinegar, and why the same strain kept under an airlock tastes rounder and fruitier.

We could not confirm from the brewery’s own copy which vessels it uses — barrels, foeders or another format — so if that level of detail matters to you, it’s a question for the brewery’s site rather than for a third-party guide.

Three to four months is a serious commitment

The brewery’s stated maturation window is typically 3–4 months. For context, a great many commercial ales go grain-to-glass in two to three weeks. Stretching that to a quarter of a year or more means every vessel of maturing beer is a vessel not earning, which is precisely why wild and mixed-fermentation beer is released in batches rather than poured year-round in every pub — and why bottles, rather than draught, are the most reliable way for most UK drinkers to get hold of the range.

Buying Holy Goat Beer in the UK

The brewery’s own web shop is the primary UK channel. Two practical notes:

• Free UK mainland delivery applies above a threshold. A figure of around £49 is widely quoted, but we could not confirm the exact current number or the exclusions against the delivery page — and exclusions are the part that catches people out. Highlands and islands deliveries, and keg versus bottle orders, are commonly treated differently from a standard mainland bottle order. Check the delivery page before you fill a basket, and treat the commonly cited figure as indicative only.
• Specialist retailers are worth checking directly. Honest Brew, Beer52 and Vocation’s own shop are the obvious UK names in this space, but we could not verify current Holy Goat stocking at any of them, so confirm before ordering rather than assuming.

For release-by-release impressions, the brewery’s Untappd profile is the place to look, alongside its Instagram and Twitter accounts. Ratings on Untappd are crowd-sourced and shift as a beer conditions in the bottle, so treat them as a directional signal rather than a fixed score.

Brewing the Style at Home: Choosing Your Yeast

Here’s the honest truth about this category: the search results for the brewery itself are owned by the brewery. The genuinely useful work a homebrewer can do is in yeast selection — because Brett, Lacto and Pedio behave nothing alike, and picking the wrong one for the beer you have in mind means three months of waiting for a result you didn’t want.

The four options below cover the realistic range: the closest thing to a full mixed fermentation, a shortcut to lactic sourness, and the two pure Brett strains that let you isolate the funk.

Wyeast 3763 Roeselare Ale Blend — the closest match to a long-aged mixed fermentation

Best for: brewers who want to reproduce the shape of a Holy Goat-style beer — funk and lactic tartness, built over months rather than days.

This is a true multi-organism blend rather than a single strain: it contains Brettanomyces, Lactobacillus, Pediococcus and Saccharomyces in one pack. That combination is what makes it the closest homebrew analogue to a commercial mixed fermentation — the Saccharomyces does the initial work, the bacteria build lactic acidity, and the Brett finishes the job slowly, chewing through sugars the other organisms leave behind and layering on phenols and esters.

Wyeast’s product page is the authority on the temperature range and pitching rate, and you should follow it rather than improvising: the bacteria in a blend like this have their own preferred conditions, and running too warm or too cool skews the balance towards funk or towards acidity.

One honest caveat, and it’s the important one: buy from a UK stockist that moves volume, and check the manufacture date on the pack. Liquid blends lose viability in transit and on the shelf, and a blend that arrives tired can underperform in ways you won’t detect until months later.

Where to buy: UK homebrew retailers; prices vary enough between them that it’s worth comparing.

Verdict: the single best starting point if you want to understand what Holy Goat is doing — provided you’re prepared to wait.

Lallemand WildBrew Philly Sour — sourness without the three-month wait

Best for: brewers who want a genuinely tart beer on a normal ale timeline.

WildBrew Philly Sour is a single strain of Lachancea thermotolerans, and it works completely differently from everything else on this list. Instead of relying on bacteria, it produces clean lactic acid as part of its own fermentation — so you get sourness in one ordinary fermentation, at ordinary ale temperatures, without a separate souring step or a months-long Brett maturation.

Lallemand’s spec sheet is the document to work from: it sets out an attenuation range and, critically, flags hop-sensitivity limits. That second point matters more than it sounds. Hop compounds can suppress lactic acid production in souring organisms, so a heavily hopped recipe can come out noticeably less tart than intended. If you’re designing anything hop-forward, check the sheet before you commit the grain bill.

One honest caveat: WildBrew Philly Sour produces no Brett character whatsoever. No funk, no 4-ethylphenol, no leather or hay. If you pitch it expecting a Holy Goat-style beer, you’ll get a clean, refreshing sour instead. It is explicitly not a Brett beer — it’s the shortcut to acidity, not to funk.

Where to buy: UK homebrew retailers; check the current listing for pricing.

Verdict: the fastest legitimate route to a sour beer at home — just don’t mistake it for a wild one.

White Labs WLP650 (B. bruxellensis) — pure funk, barnyard end

Best for: isolating the Brett character on its own terms, in a beer built around a single strain.

WLP650 is Brettanomyces bruxellensis, the classic strain most associated with the horse-blanket, barnyard and leather descriptors. In a beer, it will ferment slowly, strip the body down to a very dry finish, and push those phenolic and leathery notes forward. If you want to know exactly what the “goat” in Holy Goat is referring to, this is the strain that shows you.

One honest caveat: pitched alone into a standard wort, this is a funk beer, not a sour beer — there’s no Lactobacillus or Pediococcus in the pack, so the lactic tartness has to come from elsewhere or not at all.

Verify the current catalogue code and UK availability directly with White Labs and its UK stockists before ordering, since strain catalogues and distributor arrangements change.

Verdict: the barnyard end of the spectrum, distilled into a single pitch.

White Labs WLP645 (B. clausenii) — the fruitier Brett

Best for: all-Brett beers where you want pineapple and tropical fruit rather than horse blanket.

WLP645 is Brettanomyces clausenii, and the one-line contrast with WLP650 is the whole reason to care: WLP650 leans barnyard and leather; WLP645 leans fruitier, with pineapple-forward esters. Both will give you a dry, attenuated finish and both take time — the difference is which side of Brett’s personality dominates the glass. For a first all-Brett brew, WLP645 is often the friendlier entry point, because the fruit esters read as appealing rather than challenging.

One honest caveat: as with WLP650, this is a yeast-only pitch, so if you want acidity you’ll need to plan for it separately. Confirm current catalogue codes and UK availability with the manufacturer and stockists.

Verdict: the expressive, fruit-forward face of Brett — a good introduction before you go full barnyard.

Bottling Brett Beer Safely

This is the section that prevents injuries and ruined batches, and it matters because Brettanomyces keeps fermenting after packaging. Unlike a standard ale yeast that flocculates and stops once the priming sugar is gone, Brett will continue slowly working through residual sugars over weeks and months in the bottle. The result, if you prime as normal, is over-carbonation at best and gushers or exploding bottles at worst.

The standard practice — documented in detail on the Milk the Funk wiki (milkthefunk.com), which specifically covers priming sugar reduction for Brett beers — is to prime to a lower target than you would for a clean ale, and to give the beer far longer in the bottle to reach a stable gravity before you judge it.

The mechanism is straightforward once you’ve seen it: priming sugar assumes the yeast will stop where it always stops, and Brett doesn’t. Because it can metabolise sugars other strains leave behind, your “finished” gravity isn’t finished at all. Treat final gravity readings on a Brett beer as provisional until they’ve been stable across a long interval, and always use heavy bottles rated for the pressure.

Cross-Contamination: The Housekeeping You Can’t Skip

Brett and souring bacteria are not the kind of thing you clean up afterwards. Once a plastic fermenter, syphon, bottling wand or spoon has touched them, the scratches on that plastic will harbour the culture indefinitely — and a subsequent clean batch fermented in the same vessel can pick up funk you didn’t ask for.

The accepted approach is dedicating all plastics — a separate fermenter, syphon, tubing, and any other soft or scratched equipment — to your mixed and Brett ferments, and never letting them back into your clean-beer pipeline. Glass and stainless can be cleaned more reliably, but plastic can’t be assumed clean.

The sanitation chapter of American Sour Beers by Michael Tonsmeire (Brewers Publications, 2014) is the standard reference on this, and the Milk the Funk wiki covers the same ground for free. If you take one thing from either source: separate equipment is cheaper than a ruined batch, and much cheaper than a contaminated house culture you can’t get rid of.

Frequently Asked Questions

Is Holy Goat Brewing the same as the goat’s cheese company? No. Holy Goat Brewing is a brewery in Dundee, Scotland, specialising in mixed-fermentation and wood-aged beer. It is a completely separate business from the Australian goat-cheese producer that happens to share the name, and the two have nothing to do with each other.

Is a Brett beer the same thing as a sour beer? Not automatically. Brettanomyces contributes funk, phenols such as 4-ethylphenol and 4-ethylguaiacol, fruity esters, and acetic acid where oxygen is present — but it does not produce lactic acid. The clean, tart, yoghurt-style sourness comes from Lactobacillus and Pediococcus, which is why a properly “mixed culture” fermentation involves both a yeast and a bacterium.

How long does a beer like this take to make? Holy Goat’s own stated figure is typically 3–4 months of maturation, which is a commercial-scale commitment most small breweries can’t sustain. At home, the timeline depends on your method: a strain like Lallemand WildBrew Philly Sour sours within a single normal fermentation, while a mixed Brett blend or a pure Brett pitch will need months before it settles into its final character.

Can I brew a sour beer at home without owning a barrel? Yes. Wood helps a commercial brewery keep a culture alive between batches and lets in the slow oxygen that shapes the finished beer, but at home a dedicated plastic fermenter with a mixed blend such as Wyeast 3763 does the same job on a smaller scale. What you can’t skip is the time and the patience.

How do I stop my Brett beer from turning into gushers or bottle bombs? Reduce your priming sugar relative to a normal ale, and don’t trust a single final gravity reading. Brett continues slowly attenuating in the bottle, so a beer that looked finished can keep dropping gravity for weeks. The Milk the Funk wiki covers priming reduction for Brett beers specifically, and it’s the reference to follow before you cap anything.

Do I need separate equipment for Brett and sour fermentations? For anything plastic, yes. Scratched plastic harbours Brettanomyces and lactic acid bacteria permanently, so a dedicated fermenter, syphon, tubing and bottling wand for your mixed ferments is the standard advice — see the sanitation material in American Sour Beers by Michael Tonsmeire.

Where can I actually buy Holy Goat beer in the UK? The brewery’s own web shop is the primary channel, with free UK mainland delivery above a threshold — check the delivery page for the current figure and for Highlands, islands, and keg-versus-bottle exclusions. UK specialist retailers such as Honest Brew, Beer52 and Vocation’s shop are worth checking, but confirm current stocking before ordering.

The Bottom Line

Holy Goat Brewing is a useful reference point precisely because it refuses the shortcuts: mixed cultures, wood, and a stated three-to-four-month maturation rather than a fast turnaround. For drinkers, the brewery’s web shop is the primary UK route to tasting that house character, and Untappd is the place to gauge how individual releases have been received.

For homebrewers, the affiliate value here isn’t in the beer at all — it’s in the yeast. Wyeast 3763 Roeselare Ale Blend is the closest analogue to a full mixed fermentation; Lallemand WildBrew Philly Sour gets you genuine lactic acidity on a normal timeline but zero Brett character; and White Labs WLP650 and WLP645 let you pick your Brett personality, barnyard-leathery or fruity-pineapple respectively. Whichever route you take, budget for the bottling guidance and the dedicated plastics as part of the cost — because with Brett, the fermentation doesn’t stop when you cap the bottle.