Barbecue Beef Sandwiches
["1 Tbsp. butter or margarine", "1 lb. ground beef", "1/2 c. chopped onion", "1 medium green pepper, chopped", "3/4 c. catsup", "1/4 c. water", "1 Tbsp. vinegar (white)", "1 Tbsp. sugar", "2 Tbsp. prepared mustard", "salt and pepper to taste"]
["In skillet, melt butter over medium-high heat. Brown the beef, onion and green pepper.", "Drain.", "Add the remaining ingredients. Simmer, uncovered, 15 minutes on low heat.", "Serve on buns.", "Serves 6."]
["butter", "ground beef", "onion", "green pepper", "catsup", "water", "vinegar", "sugar", "mustard", "salt"]