Place the bratwurst into a large dutch oven with about 1 Tablespoon of bacon drippings over medium heat; cook and stir the bratwurst until the pieces are browned and no longer pink inside, (takes about 15 minutes). Remove from pot, set aside. Drain excess grease.
Place remaining bacon drippings into the dutch oven, along with the bell pepper, jalapeno pepper, and garlic and saute until the onion is translucent.Add the bratwurst back into the pot, stir in the sauerkraut, beans, diced tomatoes, tomato sauce, tomato juice, beer and spices.
Bring the chili to a boil, reduce the temperature to low, and stir in the chocolate until melted.
Simmer on low, stirring occasionally for a few hours. OR Place in your crock pot on low and let it take it's time without any work from you.