Slow Cooker Barbecue
["2 to 2 1/2 lb. boneless beef roast, trimmed", "2 onions, chopped", "3/4 c. carbonated cola", "1/4 c. Worcestershire sauce", "1 Tbsp. vinegar", "2 cloves garlic, minced", "1 tsp. beef bouillon granules", "1/2 tsp. dry mustard", "1/4 tsp. red pepper", "1/2 tsp. chili powder", "1/2 c. ketchup", "2 tsp. butter or oleo"]
["Combine roast and onions in slow cooker.", "Combine cola and next 7 ingredients; reserve 1/2 cup in refrigerator.", "Pour remaining mixture over roast and onions.", "Cook, covered, on high for 6 hours or until meat is very tender.", "Drain, cool and shred meat.", "Keep warm."]
["boneless beef roast", "onions", "carbonated cola", "Worcestershire sauce", "vinegar", "garlic", "beef bouillon granules", "dry mustard", "red pepper", "chili powder", "ketchup", "butter"]