Extra light olive oil bout a cup / Soy sauce 1/8 a cup / 1 table spoon garlic / Black pepper to taste.Blend with butt in a gallon sized zip loc bag and marinate for one hour then grill on the Q hot & fast for a couple minutes.Good luck,
SZ

The marinade should have a real light brown color if mixed correctly....don't want to much soy as it will over power and be salty.