Whatever you do with them, make sure you scrub them individually with a brush under cold water to dislodge the dirt and sand from the outer shell. Nothing ruins an oyster cooked or raw like grit.
1. Raw is my preferred method. The shooter in a shot glass with your fave bloody mary recipe or on the half shell on crushed ice with cocktail sauce, lemons, tabasco and
mignonette. Be sure no shell splinters remain as this is also a ruiner of good oysters.
2. Grill 'em, but be sure the cup side is down and the flat side up. Wait until they open a bit (about 4 minutes on hot coals), peel the lid off, and serve family style on a plate of slightly moistened rock salt for a stable bed. This keeps the precious liquor inside. Same condiments as for raw - keep it simple. Or make your bloody mary with chopped tomatoes instead of juice and place a dollop on each oyster. Or, melted garlic butter. Or, grated cucumber and fresh ginger. Or, finely diced green apple, lemon juice and crushed chili flake. Or, mango, cilantro and lime. Or...
Have fun and enjoy.