SAN DIEGO — Troels Prahl, a brewer and microbiologist at the Southern California yeast distributor White Labs, sits at his company’s tasting room bar with four half-pints of beer. He describes each between thoughtful sips.
The first has a malty backbone and a crisp body of raspberry, rosemary and banana, he says; the second, a waft of white raisin and final bite of olive brine; the third flows thick and smooth like a classic English ale; and the fourth is perfumed with a dry and subtle blend of nutmeg and fresh straw.
The beers’ colors are as varied as their flavors, ranging from cloudy gold to clear amber. Yet with the single exception of the yeasts used to ferment them, Mr. Prahl explains, they are all the exact same brew.
http://www.nytimes.com/2014/05/27/science/craft-beer-at-the-genetic-level.html?src=me&ref=general&_r=0
What really surprised me is that the brewer Budweiser has an armed guard on their yeast. God knows why, it’s close to undrinkable.
