Spicy Party Meatballs

12 oz jar cocktail sauce
1/2 small, sweet onion
10.5 oz jar jalapeno jelly
1/3 (3 lb) pkg frozen meatballs

Cook first 3 ingredients in Dutch oven over medium heat, stirring until jelly melts & mixture is smooth.  Stire in meatballs.  Reduce heat and simmer until heated through.