For the cheese topping: Mix the Parmesan, mozzarella, garlic, lemon juice, lemon zest and parsley in a bowl and reserve for later use.
For the finishing butter: Place the butter, lemon juice, hot sauce, Worcestershire, chopped garlic, granulated garlic and 1/2 cup water into a small pot on the stove. Slowly melt and whisk ingredients until incorporated.
For the oysters: Preheat the grill until it is very hot, about 400 degrees F.
Top each oyster with a liberal amount of the cheese mixture. Carefully place the oysters on the grill and close. Cook until the cheese is melted and the oysters are starting to get some color, about 10 minutes.
Remove the oysters from the grill with tongs and place them onto a cookie sheet or a heat-proof surface.
Arrange 6 oysters per plate or leave on the large platter. Ladle some melted garlic butter over the oysters.
Serve with grilled bread to soak up the juices and butter!
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.