Barbeque Beef Sandwiches 17 May 13

3 lb s arm beef roast
1/2 cup onion
1 tbsp sugar
2 tsp paprika
1/2 tsp pepper
2 tsp salt
2 tsp dry mustard
1 cup ketchup
1 cup water
1 tbsp brown sugar
1 tbsp Worcestershire sauce
1/3 cup vinegar

Mix all ingredients together. Pour over beef roast and roast for 3 hours at 325-350 degrees. Serve on buns.