Saute lightly until clear but not overdone:

1/3 c. onion, finely chopped
1/3 c. green pepper, finely chopped

1 can Campbell's tomato soup
2 tbsp. brown sugar
4 tsp. Worcestershire sauce
1 tbsp. prepared mustard

Blend and simmer before adding meatballs. (Ingredients are for a pound of meat with ample sauce!)