While one of the most time-consuming foods to make, the stew is pretty much the most nutritious way to cook a food. It is a combination of foods which are slowly simmered. The result is a broth that collects nutrients without letting them get boiled or steamed off. Foods are quietly broken down and made much more digestible.
TODO - Find the reference to the Fussians in world war (one or two?) and the unit which had the lazy cook who only made stews.. and their unit was the most physically fit and healthy even on heavy rationing.