1 chuck roast, 1 1/2 inches thick (3 to 4 lbs.)
2/3 c. lemon juice
1/3 c. salad oil
2 tsp. Adolph's meat tenderizer
1 1/2 tsp. salt
1/8 tsp. pepper
1 tsp. Worcestershire sauce
1 tsp. prepared mustard
1 tsp. onion salt

Mix together all ingredients except chuck roast. Pour liquid over roast and marinate for at least 3 hours in pan. Grill for at least 15 minutes on each side. Total cooking time is 30 minutes. Serves 6.