Step 1Heat the grill over medium-high heat.
Step 2Melt the butter with the garlic and pepper in a large skillet.
Step 3Mix together the Parmesan and Romano cheeses in a small bowl.
Step 4Put the oysters on the grill. Spoon some of the melted butter mixture on each oyster. Add a pinch of the combined cheeses to each oyster, then add a pinch of parsley. Grill the oysters until they are hot, bubbly and puffed, about 8 minutes.