Chuck Roast BBQ

2 1/2 lb. chuck roast boneless
2 med. onions
1 12 oz. coke
1/3 c. Worcestershire sauce
1 1/2 tbsp. vinegar
1 1/2 tsp. beef bullion granules
3/4 tsp. dry mustard
3/4 tsp. chili powder
1/4 tsp. red pepper
3 cloves garlic
1 c. ketchup
1 tsp. butter/margarine
1 package buns

Roast & add onion. Combine next 8 ingredients & pour over roast. Chill 1 c. sauce.
Cook on high for 6 hrs or low 9 hrs. Remove roast & onion from crockpot, shred meat. Combine 1 cup sauce, ketchup, & butter cooking until heated.
Pour over shredded meat & keep warm in crockpot.

From: Southern Living