2 tbsp. vinegar
3/4 c. water
2 tbsp. sugar
2 tsp. prepared mustard
1/2 c. barbecue sauce
1/2 c. chopped onion
1/2 c. catsup
1 tbsp. Worcestershire sauce
2 c. cooked shredded roast beef or pork
10 hamburger buns

Combine vinegar, water, sugar, mustard, onion, catsup, Worcestershire sauce. Simmer uncovered for 20 minutes. Add barbecue and meat. Continue cooking for 5 minutes. Serve on hamburger buns.