Russian Salad

The original version of the salad was invented in the 1860s by Lucien Olivier, the chef of the Hermitage restaurant, one of Moscow's most celebrated restaurants. Olivier's salad quickly became immensely popular with Hermitage regulars, and became the restaurant's signature dish.
The exact recipe -- particularly that of the dressing -- was a jealously guarded secret, but it is known that the salad contained grouse, veal tongue, caviar, lettuce, crayfish tails, capers, gherkins, cucumbers, hard-boiled eggs and soy beans. Other reported ingredients included truffles, cubed aspic and smoked duck, although it is possible that the recipe was varied seasonally. The original Olivier dressing was a type of mayonnaise, made with French wine vinegar, mustard, and Provencal olive oil; its exact recipe, however, remains unknown.

http://en.wikipedia.org/wiki/Russian_salad