Leeks are a common ingredient in soups and stews. They have a subtle flavor, so they won t overpower the other ingredients in your dish.u003cbr/u003eu003cbr/u003eThey're also great additions to stir-fries, casseroles, and pasta dishes. Leeks can soak up the flavor of whatever r sauce you use for your stir fry or casserole, which makes them an excellent option if you're trying to avoid heavy sauces that might overwhelm other flavors in your meal.