1 cup sherry
1/2 cup extra-virgin olive oil
Medium onion, minced
6 garlic cloves, minced
1 tablespoon Worcestershire sauce
1 tablespoon Dijon mustard
1 tablespoon mixed herbs
1/2 teaspoon coarsely ground black pepper
1 teaspoon soy sauce
1 tablespoon dry vermouth
Combine all ingredients, and marinate the chicken for about three hours before grilling.
Grill the chicken until it is cooked through and serve.