How to Make It
Preheat grill to high (450°F to 500°F). Stir together butter, parsley, horseradish, garlic, Worcestershire, zest, salt, paprika, and hot sauce in a bowl until well blended. Place about 2 teaspoons butter mixture in each oyster. Arrange oysters in a single layer on oiled grates, keeping oysters as level as possible. Grill, uncovered, until butter is completely melted and just starting to bubble, about 7 minutes.
Carefully remove oysters from grill, and serve immediately.