The French word for aromatic or flavoring vegetables, used frequently when making stock, soups or sauces. A brown mirepoix (which will be browned in hot oil before being used) consists of 2 parts onion, 1 part carrot and 1 part celery (measured roughly by volume). A white mirepoix (generally added raw or lightly cooked in oil without browning) consists of 1 part onion and 1 part celery.