Demi-glace warm. At this point, the espagnole is prepared, and when it is finished, the brown stock is added in equal portions to the espagnole. Demi-glace keeps very well, about six months refrigerated or almost indefinitely frozen. Due to the considerable effort involved in making the traditional demi-glace, chefs commonly substitute a simple "jus lié" of veal stock or to create a simulated version, which the American cookbook author Julia Child referred to as a "semi-demi-glace"(i.e. sans espagnole sauce). However, even today, many chefs who prepare French "haute cuisine" use a demi-glace prepared in their own kitchen. Concentrates and mixes, mostly
French cuisine more elaborate style with extensive explanations of technique. Additional smaller preparations are included in this edition as well, leading to lighter preparations, and adding a third course to the meal. Ragout, a stew still central to French cookery, makes its first appearance as a single dish in this edition as well; prior to that, it was listed as a garnish. Shortly before the French Revolution, dishes like bouchées à la Reine gained prominence. Essentially royal cuisine produced by the royal household, this is a chicken-based recipe served on vol-au-vent created under the influence of Queen Marie Leszczyńska, the wife of