Mirepoix is a foundational mixture in cooking, primarily made from diced vegetables. Traditionally, it consists of onions, carrots, and celery, typically in a ratio of 2:1:1. This blend is sautéed in fat, such as oil or butter, to create a flavorful base for soups, stews, sauces, and other dishes. The technique of using mirepoix dates back to French cuisine and is essential for building depth of flavor. Variations exist, such as soffritto in Italian cooking, which may include garlic and herbs. Overall, mirepoix is a versatile and essential component in many culinary traditions.