Aromatic Bases

Mirepoix

Also: mirepois, mirepoix base, French aromatic base

The foundational French aromatic trio of onion, carrot, and celery, cooked in fat to build depth in stocks, braises, and sauces.

/meer-PWAH/French; named after Charles-Pierre Gaston François de Lévis, duc de Lévis-Mirepoix (1699–1757), a French field marshal whose cook is credited with developing the technique — though this attribution is largely apocryphal. The term appears in French culinary literature from the mid-18th century.

Definition

Mirepoix (meer-PWAH) is the canonical aromatic base of French classical cookery: roughly two parts onion to one part carrot to one part celery, cut into a uniform dice and gently sweated in butter or oil. The vegetables are not browned in a standard mirepoix — they are softened until translucent, releasing their sugars, moisture, and volatile aromatics into whatever liquid or fat surrounds them. In stocks, a mirepoix is added raw or lightly sweated; in braises and sauces it is sweated first to mellow its sharpness. The standard ratio by weight is 2:1:1 (onion:carrot:celery), a proportion credited to the French classical tradition codified by Escoffier. Variations serve specific purposes: a white mirepoix (mirepoix au blanc) replaces carrot with parsnip or additional leek and omits celery root to avoid color — used for white stocks (fond blanc), velouté, and delicate cream sauces. A matignon is a mirepoix cooked with ham and used to braise meat. The size of the dice is calibrated to cooking time: a large rough chop for a six-hour stock, a fine brunoise for a ten-minute pan sauce. Mirepoix is not served in the finished dish — it is typically strained out — making it a flavor tool rather than a textural element.

In use

“Sweat the mirepoix in butter over medium heat until the onions are soft and translucent before adding the wine and stock for the braise.”

Related terms

SoffrittoRefogadoHoly TrinityBrunoise MatignonWhite MirepoixSweating

References

1.Le Guide Culinaire — Auguste Escoffier
2.The Professional Chef — The Culinary Institute of America
3.Larousse Gastronomique — Prosper Montagné
4.Jacques Pépin: New Complete Techniques — Jacques Pépin

Confidence: high

Notes

White mirepoix (mirepoix au blanc)

When color must be avoided — in white veal stock, velouté, or cream of mushroom soup — carrot is replaced with an equal weight of parsnip, leek white, or additional onion. Sometimes celery root (celeriac) is added for depth. The fat used is clarified butter rather than whole butter (to avoid browning milk solids). Everything is sweated over low heat with a cartouche until completely softened but not golden.

Caramelized mirepoix (for brown stock)

In fond brun and espagnole sauce, the mirepoix is intentionally browned — often in the same roasting pan as the bones — to develop deep Maillard flavors and the brown color of the sauce. The vegetables are pushed to the oven or a high-heat burner until they carry a deep mahogany color on their cut faces, contributing both sweetness and complexity.