Heat butter in a skillet. Cook the onion, pepper and mushrooms for about 10 minutes or until tender. Add the paprika, tomatoes or liquid and bring to a simmer; season to taste with salt and pepper.
Add beef and vegetables to sauce and gently reheat until ingredients are heated through. Remove from heat, add sour cream if you wish and dill; serve over noodles, boiled potatoes or rice.
Recipe Courtesy of �Michelle Urvater