I believe classics exist in cooking for a reason. Like many works of art, when something strikes a chord with people, the chances of longevity are increased. There are films, operas and symphonies that have passed the test of time and still continue to please it's audience. Cuisine isn't much different. No doubt there are many recipes and dishes from 19th century France that were popular then, but over time fall into obscurity. Chaud-froid sauce is an example of a sauce that is rarely used these...