question: What is a good beer pairing for Bratwurst and Mustard?
answer: A great choice for Bratwurst and Mustard is Small Batch: Kellerbier (Crisp Unfiltered Goodness.). Here's the recipe:
  A Crisp Unfiltered Goodness. with 4.5% ABV. Uses 4 malts and 3 hop varieties. Brewing tip: Kellerbier translates to cellar beer, if you don’t have a cellar just make sure to keep the fermentation temperature as close as possible to what you'd expect in a bavarian basement.