Spanish Marinade

1 onion
2 cloves garlic
2 tablespoons prepared whole seed mustard
1 cup sherry
2 tablespoons brown sugar
2 teaspoons cornstarch

Peel and finely chop onion. Crush, peel and mash garlic. Mix ingredients together in a bowl or plastic bag. Add the food to be marinated and turn to coat. Cover or seal and marinate for 2 hours at room temperature or overnight in the refrigerator. Remove from marinade to grill.
Makes enough for 17½oz. chicken.