The term Mirepoix comes from the French cooking vocabulary. Mirepoix (mire ‘eh-pwah) is a combination of chopped or diced carrots, onion, and celery. The word is believed to have originated around the time of Louis XV.
Mirepoix is frequently used as a vegetable starter for soups, stews, stuffings, sautés, and sauces.
Mirepoix is frequently used as an accompaniment for roasts to add flavor to roasts, especially, the drippings.