Sauces for salads are often called "dressings". The concept of salad dressing varies across cultures. In Western culture, there are three basic types of salad dressing: * Vinaigrette * Creamy dressings, usually mayonnaise-based, but which may also contain yogurt, sour cream, or crème fraîche * Cooked dressings, which resemble creamy dressings, but are usually thickened by adding egg yolks and gently heating. Vinaigrette /v?n???r?t/ is a mixture (emulsion) of salad oil and vinegar, often flavored with herbs, spices, salt, pepper, sugar, and other ingredients. It is used most commonly as a salad dressing,[8] but also as a sauce or marinade. There are many commonly used salad dressings in North America. Traditional dressings in southern Europe are vinaigrettes, while mayonnaise is predominant in eastern European countries and Russia. In Denmark, dressings are often based on crème fraîche. In Asia, it is common to add sesame oil, fish sauce, citrus juice, or soy sauce to salad dressings