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.
Blue cheese dressing the emulsion) is a potential problem with blue cheese dressing. Microbial spoilage is a concern for any type of processed food. Studies have shown that "Saccharomyces bailii" and "Lactobacillus fructivorans" are two common microorganisms that spoil salad dressings. "Lactobacillus fructivorans" is a facultative anaerobe that is acid tolerant, and can survive in a low pH food such as blue cheese dressing. Blue cheese dressing Blue cheese dressing is a popular salad dressing and dip in the United States. It is usually made of some combination of blue cheese, mayonnaise, and either or all buttermilk, sour cream or yogurt, milk, vinegar,