A mirepoix ( ; ) is a roughly chopped vegetable cut, usually a mixture of onions, carrots, and celery (either common pascal celery or celeriac); the traditional ratio is two parts onions, one part carrots, and one part celery. Mirepoix, raw, roasted or sautéed with butter or olive oil, is the flavor base for a wide variety of dishes, such as stocks, soups, stews and sauces.