Meatball Appetizer Sauce - cooking recipe

Ingredients

1 (8 ounce) bottle ketchup
1/2 cup water
1 cup brown sugar
1 small onion
3 tablespoons Worcestershire sauce
2 tablespoons mustard
1/2 cup vinegar

Preparation

Brown onion in 1 tablespoon of butter. Add all the ingredients, including the onion into a pot or crockpot.
The original recipe said to simmer meatballs (I use about 50 frozen meatballs)in sauce for 2 hours, however I have simmered them in a crockpot all day. For a party, I put all the ingredients, including the meatballs in the crockpot and put it in the refrig. overnight. The next day, I plug in the crockpot, stir once in a while and enjoy!