Sauce gribiche
Sauce gribiche is a cold egg sauce in French cuisine, made by emulsifying hard-boiled egg yolks and mustard with a neutral oil like canola or grapeseed. The sauce is finished with chopped pickled cucumbers, capers, parsley, chervil and tarragon. It also includes hard-boiled egg whites cut in a julienne. Classically, sauce gribiche may be served with boiled chicken, fish , calf's head, tripe, or cold terrine. Modern variations pair sauce gribiche with vegetables, such as asparagus, charred lettuce or leeks, or served as a dip.
Source: Wikipedia
Recipes
Grilled Venison Hearts with Arugula, Sauce Gribiche & Shallots - Andrew Zimmern
Don’t be shy. Ask your butcher for venison hearts. Out of venison? Substitute lamb, calf or ox heart if you like. Most meat markets can easily accommodate these special orders. Cooking wild food is not about trying to cover up the unique flavor of game...