question: What is a good beer pairing for Smoked bratwurst and mustard?
answer: A great choice for Smoked bratwurst and mustard is U-Boat (w/ Victory Brewing) (Smoked Porter Collab With Victory Brewing.). Here's the recipe:
  On the palate is a big dark malt sweetness, balanced by the blend of spicy Mittelfruh and citrussy Galena. Cocoa powder, rich dark chocolate, and ripe berries interplay with a toasty burnt sugar bitterness. The mouthfeel is thick and chewy with a treacly quality that doesn’t cloy, as it plays off against the hops and roast malt bitterness.
  ABV: 8.4% | IBU: 50
  Malts:
  - Extra Pale (6.35 kilograms)
  - Crystal 150 (0.48 kilograms)
  - Carafa Special Malt Type 1 (0.48 kilograms)
  - Chocolate (0.48 kilograms)
  - Munich (1.92 kilograms)
  - Smoked Warminster (0.48 kilograms)
  Hops:
  - Hallertauer Mittelfrüh (7.5grams @ start)
  - Hallertauer Mittelfrüh (11.5grams @ middle)
  - Galena (19grams @ middle)
  Yeast: Wyeast 2007 - Pilsen Lager™
  Method: Mash: 65°celsius for 75min
  Tip: A good Porter is dependant on a long fermentation and cellaring process. Keep the temperature controlled as much as possible.