A small sauce pan should be warmed up slowly. Add the butter and olive oil after they are heated. Add the garlic and cook for 30 seconds or until fragrant. Add the parsley, salt, pepper, lemon juice, and chili flakes. Turn the heat off.
Shuck and grill the oysters:
If you are an expert shuckmeister, shuck the oysters and place a small amount of sauce in each one. Oysters should be cooked for 5–6 minutes, or until the edges of the oysters begin to curl, on a very hot, prepared grill.
If you're unable to shuck the oysters, place them cup side up on a very hot, previously heated grill, cover them, and cook for one minute. The oysters ought to be just starting to open. Remove the oysters right away.
Using an oven mitt to hold the oyster, pull it open with a shucking knife. It must be simple to open.
After adding sauce to each oyster, put them back on the grill. Grill for 4–5 minutes covered.