Two Breweries, One Purity Standard: Weihenstephan to Hofbrauhaus

Sixty three degrees Celsius. That is where you hold a decoction mash if you want the enzymes working without cooking them off, and it is close enough to the reading I clocked off the demonstration kettle in the Weihenstephan visitor center before I had my jacket off. Old habit. I got up the hill above Freising a little after nine, before the tour groups arrived, and looked down at the Isar doing the thing rivers do in the morning, which is nothing dramatic, just moving.

Weihenstephan has been brewing on this hill since 1040, when Abbot Arnold received brewing and selling rights from Otto I, the bishop of Freising at the time. Not a legend dressed up for the gift shop, a recorded transaction, which I trust more than a plaque with an adjective on it. Call it the oldest continuously operating brewery in the world and you are on solid ground: 986 years of somebody in this building deciding whether the batch was good enough to sell.

The gable over the entrance just says 1040 in plain numerals, no slogan underneath it, as if the year were doing all the marketing anybody needs. I have worked in breweries that print three sentences of copy on a single tap handle. This one uses four digits and lets the arithmetic speak.

Munich is not Freising, but the law that still governs what goes into my own tanks came out of a short drive from here. In 1516, Bavarian Duke Wilhelm IV signed off on barley, hops, and water as the complete ingredient list, at a meeting of the Assembly of Estates in Ingolstadt, an hour or so north. Yeast is missing from the wording because nobody in that room understood fermentation as a living process yet, they just knew it worked. Five hundred and ten years later, that is still the standard I hold everything else against, whether I am walking a working brewhouse or standing in line for a festival tent pour.

The tour takes you past copper kettles that do not look like museum pieces because they are not, they are in daily rotation, and a guide who could recite the hop bill for the Hefeweissbier without glancing at a card. I put a hand near the mash tun jacket more from reflex than need and got the even heat you want, no cold spots, nothing scorching at the seams. My own brewery runs a variant of the same three vessel layout. Watching one nine hundred and eighty six years older doing the identical job made this feel less like a holiday stop and more like auditing a very old, very competent colleague.

The Original Helles they poured us afterward held a two finger head for most of the glass, and the carbonation prickled properly on the tongue instead of going flat under the foam, the kind of detail you only notice after a decade of checking for its absence. Nothing about the pour was trying to impress anybody. It was just correct.

Downhill from the brewery gate, a kiosk was selling a bottled radler marketed as a traditional Bavarian mix, half beer and half lemon soda run from a syrup gun, the line looped over the counter like an afterthought. Traditional is doing a lot of work on that label. A proper radler is usually fresh lemonade cut in front of you, not concentrate squeezed from a nozzle into a bottle with a rustic font on it. Wouldn't pass purity law, though in fairness the purity law never had an opinion on radler, since it did not exist in 1516. Failed my personal version of it anyway.

Verdict on Weihenstephan: passes clean. Barley, hops, water, and a yeast they did not have a name for yet in 1516, all handled the way the later law would have approved of anyway. If a 986 year operating history counts as a shortcut, I do not know what the long way round is supposed to look like.