Poke holes in the beer bratwurst and pre-cook the package in the microwave for about 4 minutes. (This gets alot of the grease out.) After pre-cooking, cut the bratwurst into 1/2 inch slices and set aside.
Put onions, bell peppers, and cabbage in a pot with oil. Cover and cook on medium for about 30 minutes. Check it often and stir.
Add bratwurst, tomatoes, salt, and pepper. Cook for another 20 minutes. Serve.
(**Use the Del Monte tomatoes with basil, garlic, and oregano.).