Cocktail Meatballs

Ingredients

• 1 lb. ground beef
• 2 Tbsp. bread crumbs
• 1 egg, slightly beaten
• 1/2 tsp. salt
• 1/3 c. green pepper, chopped
• 1/3 c. onion, chopped
• 2 Tbsp. butter
• 1 can tomato soup
• 2 Tbsp. brown sugar
• 4 tsp. Worcestershire sauce
• 1 Tbsp. mustard
• 1 Tbsp. vinegar