Mignonette sauce is a condiment usually made with minced shallots, cracked pepper, and vinegar. It is traditionally served with raw oysters.
Raw oysters on the half-shell served with cocktail
and mignonette sauces
The French term "mignonette" originally referred to a sachet of peppercorns, cloves, and spices used to flavor liquids, but now simply means cracked pepper.
Though different mignonette sauces may use different types of vinegar, all contain pepper and shallots.