Classic mignonette is a simple French sauce made with vinegar, shallots, and black pepper, traditionally served with raw oysters. Its bright acidity balances the clean, briny flavor of the shellfish, making it one of the easiest—and most classic—accompaniments you can serve alongside a platter of freshly shucked oysters. This classic mignonette recipe keeps things simple with just three pantry ingredients: red wine vinegar, finely chopped shallots, and freshly ground black pepper.