Until I started pickling hop shoots, I had never heard of that, either. Here are the 2 recipes that I first came across: From the Tasting Table and Food52. They add chiles or hot pepper flakes, but I'm not a fan of that, lol. You can see they use different ratios of vinegar to beer, but I use the Food 52's 1:1 ratio. The kind of beer really does make a difference, too. A sour beer, like a gose, is really good!