Roux
Roux () is flour and fat cooked together and used to thicken sauces. Roux is typically made from equal parts of flour and fat by weight. The flour is added to the melted fat or oil on the stove top, blended until smooth, and cooked to the desired level of brownness. Butter, vegetable oils, bacon drippings or lard are commonly used fats. Roux is used as a thickening agent for gravy, sauces, soups and stews. It provides the base for a dish, and other ingredients are added after the roux is complete.
Roulade
Some roulades consist of cake (often sponge cake) baked in a flat pan rolled around a filling. Cake rolled around jam, chocolate buttercream, nuts or other fillings, is an example of a sweet roulade like the bejgli or the Swiss roll. The bûche de Noël or "Yule log" is a traditional French Christmas cake roll, often decorated with frosting made to look like bark.