First popularized in the 1940s at a restaurant called Café de Paris in Geneva, this sauce is thought to consist of a large number of ingredients such as butter, ketchup, Dijon mustard, capers, shallots, parsley, chives, marjoram, dill, thyme, rosemary, garlic, anchovies, chicken livers, brandy, Madeira, Worcestershire sauce, paprika, curry powder, lemon, orange zest, salt, and cayenne powder, although the exact recipe is still closely guarded by the restaurant.