Hollandaise sauce mayonnaise and Béarnaise, the egg does not coagulate as in a custard; rather, the lecithin in the eggs serves as an emulsifier, allowing the mixture of the normally immiscible butter and lemon juice to form a stable emulsion. To make hollandaise sauce, beaten egg yolks are combined with butter, lemon juice, salt, and water, and heated gently while being mixed. Some cooks use a double boiler in order to control the temperature. Some recipes add melted butter to warmed yolks; others call for unmelted butter and the yolks to be heated together; still others combine warm butter and eggs in
Cuisine of the Southern United States called "chow"), a relish known as corn ketchup and fried green tomatoes; tomatoes are also used in tomato gravy, a variant of sausage gravy with a thinner, lighter roux. A variety of wild fruits like pawpaws, wild blackberries, and persimmons are also commonly available in Appalachia as well. Cuisine of the Southern United States The cuisine of the Southern United States developed in the traditionally defined American South, influenced by African, English, Scottish, Irish, French, Spanish, and Native American cuisines. Tidewater, Appalachian, Creole, Lowcountry, and Floribbean are examples of types of Southern cuisine. In recent history, elements of Southern cuisine