Is Beer Kosher?

Beer is four things: water, malt, hops and yeast. On that basis it looks like one of the simplest drinks there is, and plain beer is largely straightforward.

The questions are about what else goes in — and most of it is there to make the beer clear rather than to make it taste of anything.

What beer is made of

Malt is barley that has been partially germinated and roasted; it supplies the enzymes that convert starch to sugar. Other grains are used in places as a sugar source — wheat, corn, rice. Hops contribute a bitter resin acid, aromatic oils and tannins. Yeast ferments the sugars to alcohol.

Some brewing traditions add spices and flavourings, which is where the first question begins.

The clarity problem, and what is added for it

A surprising amount of what goes into commercial beer exists to address haze.

Enzymes for clear beer. The natural enzymes in malt do not fully break the starch down — chains of polysaccharides remain dissolved and keep the beer from being entirely clear. Producing genuinely clear beer therefore calls for an added enzyme at the boiling or fermentation stage. That enzyme may be produced by microorganisms grown on a medium containing forbidden materials.

The analysis is interesting rather than simple. The enzyme is present in a quantity that would ordinarily be nullified, but authorities differ about substances that are nullified and yet affect the appearance of a food. One argument runs that the forbidden material does not itself create the appearance — it only enables the appearance to form — which is not the same as contributing taste. Against that, if the enzyme is not kosher, there is the separate problem of deliberately nullifying a prohibition.

Enzymes for chill haze. Cooling causes protein and polyphenol complexes to come out of solution. One remedy is adding a protein-digesting enzyme, and the source of such enzymes is a question in its own right.

Body and mouthfeel aids. Some breweries use processing aids to give the beer body, and the status of those materials needs establishing.

The yeast

This is the least visible question and one of the more substantial.

Brewing yeast is recycled through roughly eight to ten cycles before contaminants accumulate and it is replaced. New cultures are grown on a gel — set with agar from seaweed, which is unproblematic — but the gel also carries nutrients, among them peptones, which are protein fragments and may be of animal or plant origin.

The question raised is whether yeast grown on a medium deliberately containing forbidden peptones is itself affected, since that first culture is what the later yeast propagates from. One reported figure puts the peptone concentration at around half a percent, which would be nullified.

A further consideration, and one that recurs across this whole subject: where a material is prepared by non-Jews for the general market and only afterwards bought by a producer supplying Jewish customers, there is reason to attribute it to the majority it was made for. Where it is prepared specifically for that producer, knowing who the customers are, the analysis is different — and the authorities divide on it.

Flavoured beers are a different question

Worth separating clearly. Breweries producing flavoured beers have absorbed material in the production line from those flavourings. These should not be used without certification and supervision — the concern is not the base beer but what the line has run.

Given how much of the market is now flavoured and seasonal varieties, this is a larger category than it once was.

And chodosh

One more, easily forgotten: beer is made from barley malt, and barley is one of the five grains. For anyone keeping yoshon, beer is squarely within that question.

What your household drinks is a matter for your rav, and practice on unsupervised beer varies considerably. See also whisky and sherry casks.