1 pound onions sliced into 1/4-inch thick rings 1/4 cup so i just used 5 3 cups beer 1/4 cup dijon mustard, plus extra for serving 1/2 teaspoon caraway seeds if you like caraway, may want to up to 3/4 teaspoon 1 cup sauerkraut, i used a whole regular-sized can a hoagie roll for each brat