Steamed leeks with mustard-shallot vinaigrette is a simple yet elegant dish that showcases the delicate flavor of leeks. The leeks are steamed until tender, then dressed with a tangy vinaigrette made with Dijon mustard, shallots, and vinegar. The vinaigrette adds a bright and zesty flavor to the leeks, making them the perfect side dish for any meal. This recipe is quick and easy to make, and is a great way to enjoy the natural sweetness of leeks.