Mignonette is an amazingly simple sauce for oysters. The peppercorns and vinegar heighten their flavor without overwhelming the oyster's pleasing brininess.
What you will need
Black or white peppercorns, coarsely ground -- 3 tablespoons
Shallots, minced -- 2 or 3
Red or white wine vinegar -- 2/3 cup
Salt -- just a pinch