Mignonette Sauce

Mignonette sauce is a condiment usually made with minced shallots, cracked pepper, and vinegar. It is traditionally served with raw oysters. The name "mignonette" originally referred to a bundle of peppercorns, cloves, and spices used to flavor dishes, but now simply means cracked pepper. Though different mignonette sauces use different types of vinegar, all contain pepper.

From Wikipedia