Thursday, 7 November 2019

Sour note

The other week, I was served a pint in a pub that tasted distinctly off to me. It was a beer I’d never had before, so it’s possible that it was intended to taste like that, but I really don’t think it was. However, it was crystal clear, had a decent head and condition, and wasn’t vinegary as such, so I didn’t realistically consider it returnable. I didn’t fancy drinking it, though, so, perhaps egged on by my companions, I ended up rather theatrically tipping it into a plant pot. I’m not going to cast aspersions on this particular pub by naming it, although if you follow Simon Everitt’s BRAPA blog he will eventually get round to writing about it.

This particular off-flavour was something that I have encountered before over the years, a rather sickly, cloying, sour-cream note. Asking the question on Twitter, several people suggested it might be butyric acid, which according to various descriptions on the Internet certainly fits the bill. It is described on this website as “Rancidity, Baby vomit, cheesy, putrid, spoiled milk or butter”.

I’ve never worked in a professional capacity in the licensed trade, and I’ve never had any formal training in beer tasting. But I’ve drunk enough beer to know that sometimes it just doesn’t taste right, often for reasons that it’s hard to put your finger on. The site I linked to lists eighteen different recognised off-flavours in beer, some of which I recognise, although others don’t really ring a bell. I’ve also often encountered beers with a distinct woody note, but not served from wooden casks, which doesn’t exactly match up with any of those listed.

If you’re familiar with a beer, it’s not too difficult to tell whether or not it tastes right. Bit in these days of ever-changing guest beers, many of which you will only try once, and of unprecedented experimentation with different flavours, it can be extremely difficult to tell whether or not a beer is actually meant to taste as it does. Added to this, it’s not unknown for brewers to turn a defect into a feature in one-off beers, such as the perhaps apocryphal case of the batch that was badly affected by the common fault known as diacetyl, which results in a pronounced caramel note, but ended up being badged as “Butterscotch Porter”. It’s also the case that, in small doses, some of the off-flavours, such as phenol, can be regarded as desirable characteristics.

From time to time I’ve had pints that to my taste are distinctly off, but others found no problem with. They might have just been being ignorant or perverse, but equally it’s possible that they just didn’t notice, as people’s susceptibility to different off-flavours varies widely. In the summer of 1984, when I was living in that part of the world, Gales Brewery in Hampshire experienced a yeast infection, which to me gave their beer a very distinct and unpleasant taint. But some people couldn’t detect it at all. After about three months, it faded away, but some might argue that their beer was never the same again. There’s a well-known off-flavour in cider known as “mouse”, which actually does impart an oddly furry texture to the drink. But, again, some people can detect it and others simply can’t.

People’s aversion to different off-flavours also varies. I’m not too bothered about diacetyl in small doses, but others really can’t abide it. And, in the discussion about butyric acid, one person said that a hint of “baby sick” was one of his least disliked off-notes, whereas I find it foul in any degree.

The burgeoning range of flavours and styles, and the sheer number of brewers, means that off-flavours in beer are something that isn’t going to go away. It’s not reasonable to expect the general drinking public to be constantly on their guard to spot them, so brewers and retailers need to take ownership of the issue, be alert to it, and not just breezily dismiss it as all part of the rich tapestry of life. And maybe there is an opportunity to do more to educate interested lay drinkers in being able to identify the various taints.


  1. Fascinating to see the continuing trials and tribulations of drinking in (What I assume are, given the BRAPA reference) "Good Beer" Guide pubs from various sources. I'm also amused by the image your final sentence conjures, of tutored tasting sessions involving sniffing and sipping ropey flights of dodgy bitter.

    In all seriousness, there is much I agree with here and it's long been my view that a constant merry go round of "here today, gone tomorrow" beers, in an increasingly bewildering array of styles, only serves to undermine cask's credulity in a marketplace where customers mostly demand consistency from one pint to the next. How to judge if a beer is "good" if there's no prior sample to compare it against?

    Sometimes quality shines through regardless of previous experience, but a ceaseless procession of beers that no-one's ever seen before, and once you've tasted them, will be grateful you'll never see again, surely only reinforces the "It's meant to be like that" mindset that I once thought that real ale culture was beginning to tear down.

  2. As a lout drinker, I never need to complain about crap beer. I do love a bit of the ethics, etiquette and protocols of complaining about crap beer which is why I like reading the ale drinkers.

  3. I was out with a group once when somebody said, "Can we have a vote on Phil's beer?". By which he meant, on whether I should take it back. He hadn't tasted it, obviously, but even across the room he could see that it was flat as gravy, with that slight haze that beer sometimes develops when it's on the turn. (And it was in fact sour.)

    I didn't take it back, though, because it was a cask beer from Wild (it was a few years ago), and the pump clip suggested to me that it was meant to be like that - or, at least, that that's the answer I would have got if I'd complained.

  4. The Stafford Mudgie8 November 2019 at 03:32

    "From time to time I’ve had pints that to my taste are distinctly off" as I'm sure we all have, but I doubt if we're always right.
    Very occasionally I might buy a pint that to my taste is distinctly off and think nothing of it, then a pint in the next pub tastes distinctly off and so on. By about the fourth pub I conclude there's nothing wrong with the beers but it's me that's wrong that day. Just one beer and it tasted distinctly off and I would have unfairly thought the blame lied with the pub.

  5. I've come across a fair few beers described as Craft - keg and cask - that haven't gone off but have serious brewing faults which are either described as a characteristic or masked to some degree by OTT hopping and/or flavourings. The apocryphal tale of the diacetyl contamination being described as butterscotch sums up the attitude of these hobby 'brewers' that inflict their inexperience and lack of skill on the unsuspecting public.

  6. Mark Crilley, noting my tendency to tip beer in plant pots, assumed I'd never tip a half I rated 3 or better on the beer scoring system.

    But a beer can be excellently presented, cool and crisp, and still not something you want to finish.

    I tipped most of a half of homebrew in a new GBG pub near Uttoxeter, even though I'd scored (effectively) the pub a 3.5. Think what they could do with proper beer like Pedigree, I thought.

  7. A dangerous occupation. Drinking draught beer. Trust them at your will.


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