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
French cuisine course) or "dessert", sometimes with a salad offered before the cheese or dessert. French regional cuisine is characterized by its extreme diversity and style. Traditionally, each region of France has its own distinctive cuisine. Paris and Île-de-France are central regions where almost anything from the country is available, as all train lines meet in the city. Over 9,000 restaurants exist in Paris and almost any cuisine can be obtained here. High-quality Michelin Guide-rated restaurants proliferate here. Game and ham are popular in Champagne, as well as the special sparkling wine simply known as "Champagne". Fine fruit preserves are known from