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 of 10:00 pm and 11:00 pm. Some restaurants close for dinner on Sundays. In French cuisine, beverages that precede a meal are called apéritifs (literally: "that opens the appetite"), and can be served with amuse-bouches (literally: "mouth amuser"). Those that end it are called digestifs. The apéritif varies from region to region: Pastis is popular in the south of France, Crémant d'Alsace in the eastern region. Champagne can also be served. Kir, also called "Blanc-cassis", is a common and popular apéritif-cocktail made with a measure of crème de cassis (blackcurrant liqueur) topped up with white wine. The phrase "Kir Royal"