Olivier salad the dressing — was a jealously guarded secret, but it is known that the salad contained grouse, veal tongue, caviar, lettuce, crayfish tails, capers, 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 Provençal olive oil; its exact recipe, however, remains unknown. At the turn of the 20th century, one of Olivier's sous-chefs, Ivan Ivanov, attempted to steal the recipe. While preparing the dressing one evening in solitude, as was his custom, Olivier was suddenly called away on some emergency.
Potato salad herbs, and vegetables (such as onion and celery). German potato salad, or "Kartoffelsalat" is served warm or cold and prepared with potatoes. Potato salad from northern Germany is generally made with mayonnaise and quite similar to its U.S. counterpart. In Southern Germany, it is made with bacon, vinegar, salt, pepper, vegetable oil, mustard, vegetable or beef broth, and onions. American potato salad most likely originated from recipes brought to the U.S. by German and European settlers during the nineteenth century. Print evidence confirms that recipes for potato salad were often included in 19th century American cookbooks. Ingredients for traditional American