Recipes: Barely grilled oysters with sherried garlic butter

Preparation:  Preparation time: 15 mins Cooking time: 30 mins Serving: 8 Ingredients: 6 tablespoons salted butter (3 ounces), divided 3 large garlic cloves, grated (about 2 teaspoons) 1/2 cup dry sherry 1 1/2 teaspoons sherry vinegar 3 tablespoons chopped fresh flat-leaf parsley, plus more for serving 2 dozen oysters on...