The term you are referring to is “vol-au-vent”. A vol-au-vent is a small, fancy-shaped piece of pastry that is commonly made with puff pastry. It is often used as a decorative element for entrees, ragouts, and other dishes. Vol-au-vents can be made in various shapes, such as round or oval, and can be filled with a variety of savory or sweet ingredients. Some popular fillings include chicken or seafood in a creamy sauce, mushroom duxelles, or fruit compote. The puff pastry shell is typically hollowed out to create a cavity for the filling, and can be served hot or cold depending on the recipe.