I was prompted to write this piece following an article
which appeared on Tandleman’s blog, entitled “Improving with Age”. The crux of
the post centred on the fact that cask-conditioned beer does actually improve when
there’s a bit of time in the cellar for conditioning to actually take place.
This is something I’ve always considered crucial to serving up a decent pint,
but it’s something which is often over-looked particularly when it comes to
maximising turn-over and keeping stock levels to a minimum.
I’ve always been interested in the practical aspects of both
brewing beer and looking after it once it’s been brewed and, without wishing to
blow my own trumpet too much, I’ve had a fair amount of experience of both.
With this in mind I decided to carry out a spot of research regarding the
history and background to cask-conditioning, but surprisingly the various
internet searches I conducted turned up very little.
There are obviously publications and training manuals
available regarding cellarmanship and cellar practice, many of which are the
accumulation of many years experience in the field. In addition they are often
specific to one particular brewery and its beers. But reasons why maturing beer
in the cask became standard practice, and exactly how and when this process was
first developed, seem lost in the mists of time. What follows therefore is very
much my own take on this, and I would welcome input from other writers and
industry analysts who will have far more knowledge than me on these matters.
I strongly suspect the practice of cask-conditioning dates
back to the time when beer, or even ale as it then was, was first kept in
wooden casks, and that the maturation process was something which occurred almost
accidentally. Many things improve with age, and beer is no exception. When “green”
or immature beer is first racked into a cask, it still contains fairly high levels
of suspended yeast cells. These would have continued nibbling away at residual
sugars still present in the immature beer. In effect, fermentation was still continuing;
albeit at a much reduced rate. The by-products of this process are a slightly increased
alcohol content, alongside raised levels of CO2 gas within the beer.
It is this dissolved carbon dioxide which gives condition to
the finished beer, and this in turn provides much of the mouth-feel which is so
desirable and satisfying to the drinker. It also contributes to the refreshing
characteristics of the beer. As any beer drinker knows, a flat beer, totally
devoid of condition, is not a pleasant drink and so this natural process and
welcome by-product of continuing fermentation was something to be encouraged
and indeed embraced.
The addition of isinglass finings was the first step along
this path. Isinglass is a gelatinous protein prepared from the swim-bladders of
certain fish. It works by attracting yeast cells, which carry a different
electrical charge, causing the yeast cells to clump together and thereby dropping to the
bottom of the cask by virtue of their size and weight. Other substances, such
as gelatine have also been tried, but these proved less effective as, unlike
Isinglass which has the ability to work several times over, they only work the
once. As casks are normally shifted around several times between leaving the
brewery and being handled in the pub cellar, this effectively rules them out,
so isinglass remains as the default choice when it comes to clearing cask ale.
Wooden casks can even be used for lager |
I would imagine that up until the mid-19th
Century, all bulk packaged beers were treated in a similar fashion, and that
virtually all were cask-conditioned. However, at some stage around this time,
especially with the move on the Continent to bottom fermented beers, things
must have changed. Bottom fermented beers are matured for far longer periods
than the more traditional top-fermented ales; with both fermentation and
maturation taking place at significantly lower temperatures. These beers would
eventually have cleared naturally, and during this time an appreciable amount
of condition would have developed in the beer.
The next steps in the evolutionary process, particularly of
bottom fermenting beers, would have been filtration and pressurised dispense.
The former ensures perfect clarity in the beer, making sure the customer gets a
clear glass every time. The latter ensures the condition, which has so carefully
been developed in the beer during the maturation process, is maintained in the
finished product and the beer has that satisfying sparkle in the glass and that refreshing and satisfying mouth-feel the customer is looking for.
Conditioning tanks |
Both these processes take us away from the concept of
cask-conditioned beer so, as this is the main subject of this post, let us
return to the British Isles where the old traditional
methods lingered, and indeed thrived.
Despite moves towards filtration and pressurised dispense across Europe,
Britain in the
19th Century was in no mood to take lessons from its continental
neighbours. Here cask-conditioning remained the main way in which beers were
brought to maturation, prior to being served to the customer.
Cask-conditioning really came to the fore during the early
years of the 20th Century, when there was a shift away from the
heavily-hopped and rather potent India Pale Ales, which had made the fortunes
of many of the Burton brewers
several decades earlier, towards lighter and more quaffable pale ales. This was
understandable as, nice though they are, a heady IPA with an ABV
of 7.0% plus, is not really a session beer and is not especially refreshing.
These weaker beers were initially known as “running ales”,
because they were deliberately sent out by brewers in an immature state in
order to finish their maturation, and hence develop condition, in the pub
cellar. They became known as “bitter”, or “bitter ale”, and like continental
Pilsner-style beers, looked attractive and sparkling in the glass. This made
them an immediate hit with the drinking public.
For certainly the first half of the 20th Century,
cask-conditioning was virtually universal in the UK,
but the practice does suffer from a number of inherent defects, the chief one
of which is the limited shelf-life of cask ale, once the cask is broached. This
problem was exacerbated by the effects of two world wars which saw quite
drastic cuts in the gravity of many beers (particularly during the Great War),
due to the need to conserve ingredients during these times of national crisis.
Weaker beers obviously don’t keep as well as stronger ones,
and there was a further problem with cask beer in so much that it is quite easy
to adulterate the contents. The disgusting practice of returning “slops” to a
cask, (particularly the mild ale cask), carried out by quite a number of
unscrupulous pub landlords, caused many drinkers to distrust draught beer, and
switch to bottled instead. In fact there was a massive rise in sales of bottled
beer, particularly after World War II, which took place at the expense of
draught (cask) beer.
I won’t repeat the story of the rise of “keg” beer as the
development of what effectively is bottled beer in a much larger container
dispensed, continental-style, by CO2 gas, is well documented elsewhere. Whilst
keg beers were embraced, certainly by many publicans for their ease of
handling, and promoted by many brewers, because they ensured a consistent pint
by reducing the chances of lazy or ignorant landlords spoiling the finished
product, they were not universally welcomed by drinkers. Many felt that the
filtration and pasteurisation processes necessary to ensure a stable product,
significantly altered the taste of the beer, and the gas used for dispense,
often accompanied by excessive cooling, had a further adverse effect on the
beer.
Perfect combination |
I suspect that a change occurred during the 1980’s, when
brewers began to exercise a lot more care over their cask-conditioned beers
than they had hitherto done. Whilst it once was considered normal practice to
rack the beer straight into casks, virtually straight from the fermenting
vessel, they now introduced an additional holding stage, whereby the “green” beer
was allowed to condition, in bulk, in enclosed tanks at the brewery. Only then,
after a sufficient time period had elapsed, was the beer run into casks.
Science would also have played a much greater role here, as
brewers started to count and monitor the number of yeast cells present in the
beer, again holding back racking until the count had fallen below a certain
level. I suspect this process has been further refined, so that much of today’s
cask-conditioned ale has a relatively low yeast count, with much of the
conditioning having taken place in bulk. Casks racked in this fashion will drop
bright fairly rapidly; often in a matter of hours, due to the low yeast counts
in the beer delivered to the pub.
Cask beer has therefore become more consistent and far
easier to handle, but like many beer drinkers, I feel it has lost something of
its character along the way. Without that extra maturation taking place in the
pub cellar, the beer is often served too young (green), and is missing some of
the subtle nuances it once had. This is particularly true of many once revered
beers which, having become victims of their own success and become far more
widely available than they once were, now taste rather bland.
Isinglass finings |
I knew someone who had such a position, albeit in a
part-time capacity. He worked for the Royal Mail in the Dartford area, but in order
to supplement his postman’s salary helped out in a local pub at weekends and on
the odd evening. He told me that certain beers, such as Bass and Worthington,
were delivered un-fined and it was his job to add the finings prior to
stillaging and venting the casks. This would have been during the 1960’s.
I didn’t know this chap especially well, but he was the
father of one of my wife’s friends. He sadly passed away a few weeks ago, so
the opportunity to question him further is now gone. It’s fascinating though
such practices were still being carried out within living memory, and also
proof of how much has changed when it comes to looking after cask-conditioned
beer.