1 1/2 lb. boneless chuck steak, 1 1/2 inch thick
1 clove garlic, peeled and minced
1/4 cup wine vinegar
1 Tbsp brown sugar
1 tsp paprika
2 Tbsp Worcestershire sauce
1/2 cup catsup
1 tsp salt
1 tsp dry or prepared mustard
1/4 tsp black pepper

Cut the beef on a diagonal, across the grain into slices 1 inch wide. Place these in the crockpot. In a small bowl, combine the remaining ingredients. Pour over the meat, and mix. Cover and cook on Low for 3 to 5 hours.