Barbecued Beef Sandwiches 01 1 1/2 pounds stew meat 1 cup chopped onions 1/4 cup firmly packed brown sugar 1 1/2 teaspoons chili powder 1 teaspoon salt 1/2 teaspoon dry mustard 1/8 cup vinegar 1 teaspoon worcestershire sauce 3 ounces tomato paste 8 hamburger buns In crockpot, combine stew meat, onions, brown sugar, chili powder, salt, mustard, vinegar, worcestershire sauce and tomato paste. Cover. Cook on low for 8 to 10 hours, or until tender. Stir with fork to break up pieces. Serve on buns.