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 combination is sautéed in fat, such as oil or butter, to create a flavorful base for soups, stews, and sauces. The technique of using mirepoix dates back to French cuisine and is essential for building depth in dishes. Variations exist, such as soffritto in Italian cooking, which may include garlic and herbs. Overall, mirepoix enhances the taste and aroma of many recipes.