chuck roast
meat tenderizer
Worcestershire sauce
1/2 c. ketchup or A.1.
1/2 c. vegetable oil
1/2 c. wine vinegar with garlic

Pierce chuck roast; cover with meat tenderizer and pepper well. Mix marinade of vegetable oil, ketchup, vinegar with garlic and a few shakes of Worcestershire sauce. Cover roast and marinate at least 12 hours. Grill and baste with marinade. Roast has better texture when room temperature before grilling.