Barbecue beef sandwiches

    
3lbbeef rump roast
3tbflour
15oztomato sauce
1/2conions, chopped
1/3cbrown sugar, packed
2tblemon juice
1tbbeef instant bouillon
2tschili powder
1eagarlic clove, chopped fine
1tsdry mustard
1xhamburger buns
Directions:
Rub flour into roast. Place in bottom of crockpot and add remainingingredients, except buns. Cook on low for about 14-16 hours. Serveover buns.