Cuts

Knife Cuts — Classical French

Mirepoix

Also: mire poix, aromatic dice, white mirepoix, brown mirepoix, holy trinity (variant)

A rough 2 cm aromatic dice of onion, carrot, and celery in a 2:1:1 ratio — the universal flavour foundation of stocks, braises, and sauces.

Mirepoix is both a knife cut and a culinary preparation: a rough dice of aromatic vegetables — predominantly onion, carrot, and celery — cut to approximately 2 cm and used as a flavour base for stocks, braises, roasting pans, and sauces. Unlike the precision dice of classical vegetable cookery, mirepoix is deliberately imprecise; the vegetables are destined to be strained out (or left as a rustic element in braises), so uniformity is secondary to efficiency. The classic French ratio is 2 parts onion to 1 part each of carrot and celery, though kitchens adjust this for specific applications. Mirepoix is attributed in French culinary tradition to the kitchen of the Duc de Lévis-Mirepoix (eighteenth century), though the technique pre-dates the name.

In photos

Mirepoix in its raw whole-cut form on a butcher's board — Mirepoix is both a knife cut and a culinary preparation: a rough dice of aromatic vegetables — predominantly onion, carrot, and celery — cut to approximately 2 cm and used as a flavour base for stock… Identifying traits: Rough 2 cm dice — no squaring or precision required, Classic ratio: 2 parts onion, 1 part carrot, 1 part celery, Intended for extraction, not consumption — typically strained or discarded after stock-making.
Mirepoix in its raw whole-cut form on a butcher's board — Mirepoix is both a knife cut and a culinary preparation: a rough dice of aromatic vegetables — predominantly onion, carrot, and celery — cut to approximately 2 cm and used as a flavour base for stock… Identifying traits: Rough 2 cm dice — no squaring or precision required, Classic ratio: 2 parts onion, 1 part carrot, 1 part celery, Intended for extraction, not consumption — typically strained or discarded after stock-making.
Where the mirepoix lives on the source. Cut from the aromatics trinity of the French kitchen: onion (or shallot), carrot, and celery stalk.
Where the mirepoix lives on the source. Cut from the aromatics trinity of the French kitchen: onion (or shallot), carrot, and celery stalk.
Mirepoix prepared the canonical way — Fond brun (brown veal stock). Cut onion in half through the root, peel, then make one horizontal cut through the middle and two or three vertical cuts from root to tip before slicing across — a rough 2 cm result is the goal, not a uniform dice.
Mirepoix prepared the canonical way — Fond brun (brown veal stock). Cut onion in half through the root, peel, then make one horizontal cut through the middle and two or three vertical cuts from root to tip before slicing across — a rough 2 cm result is the goal, not a uniform dice.

Where it comes from

Cut from the aromatics trinity of the French kitchen: onion (or shallot), carrot, and celery stalk. Leek tops and parsley stems are common additions. White mirepoix substitutes parsnip or additional celery for carrot, avoiding colour contribution in white stocks. Brown mirepoix may be cut from caramelised or roasted aromatics before or after dicing, or simply diced and allowed to caramelise in the pot.

Rough 2 cm dice — no squaring or precision requiredClassic ratio: 2 parts onion, 1 part carrot, 1 part celeryIntended for extraction, not consumption — typically strained or discarded after stock-makingWhite mirepoix omits carrot (or substitutes parsnip) to avoid amber colouring in light stocksBrown mirepoix is caramelised before or during stock-making to contribute roasted depthLarger pieces (up to 4 cm) for long-cooking stocks; smaller (1 cm) for quick braises and pan sauces

Best for

Veal, beef, chicken, fish, and vegetable stocksBraises and pot roasts (left in the braising liquid)Roasting pan fond for pan sauces and graviesCourt-bouillon for poaching fish and shellfishSoup bases (soupe de légumes, potage)Tomato and red wine sauces (soffritto equivalent)

How to cook it

  1. 1Cut onion in half through the root, peel, then make one horizontal cut through the middle and two or three vertical cuts from root to tip before slicing across — a rough 2 cm result is the goal, not a uniform dice.
  2. 2Trim carrot tops and tips, halve lengthwise, then cut across into 2 cm chunks.
  3. 3Trim celery stalks, halve lengthwise if wide, and cut across into 2 cm pieces.
  4. 4For white mirepoix (fond blanc, velouté): omit carrot entirely or replace with an equal volume of parsnip, white leek, or additional celery.
  5. 5For brown mirepoix: heat a film of neutral oil in the stock pot or roasting pan over medium-high heat; add mirepoix and cook without stirring until deep golden-brown on one side (8–12 minutes), then stir and continue until evenly caramelised.
  6. 6For stocks: add raw mirepoix in the final 45–60 minutes of a long stock (earlier addition dulls flavour); for shorter stocks (fish, shellfish), add at the start and simmer the full 20–30 minutes.
  7. 7For braises: brown the protein first, remove, then soften the mirepoix in the same fat before deglazing — the fond from the protein enriches the braising liquid.

Prep & butchery

  • Size scales with cooking time: a 4-hour veal stock wants 3–4 cm rough pieces; a 30-minute pan sauce wants 1–1.5 cm pieces that will soften fully in the allotted time.
  • No need to peel carrots for stock mirepoix — scrub them; the peel contributes colour and flavour.
  • For roasting pan mirepoix under a leg of lamb or beef joint, cut even larger (4–5 cm) so the pieces don't burn under hours of dry heat.
  • Celery leaves (not usually sold attached in retail) are a welcome addition — they carry strong celery flavour.
  • Garlic is not classical French mirepoix but is standard in many contemporary and regional stocks — add it whole and unpeeled for a longer cook.

Substitutes

  • Soffritto (Italian)

    Onion, carrot, and celery — an identical combination used across Italian cuisine; the term and proportions differ by region but the function is the same.

  • Holy Trinity (Cajun)

    Onion, celery, and bell pepper (no carrot); standard aromatic base for Cajun and Creole cooking.

  • Sofrito (Spanish/Latin American)

    Tomato, onion, garlic, and pepper-based aromatic paste; different vegetables and texture but serves the same role as a flavour foundation.

  • Battuto (Italian)

    Finely chopped garlic, onion, and herbs as an aromatic starting base; finer texture than mirepoix but comparable function.

Related cuts

  • Macédoine (1 cm dice)

    The precision dice of the same basic cube shape, used for presentation — the inverse of mirepoix's rough efficiency.

  • Brunoise

    Fine 3 mm dice; used as a refined aromatic base in sauces (matignon) where mirepoix pieces would be too large to leave in.

  • Matignon

    A sweated, edible version of mirepoix — diced finer (1 cm), cooked until completely soft in butter, and incorporated into the finished dish rather than strained.

  • Paysanne

    Thin, 1 cm × 1 cm × 3 mm flat squares used as an alternative aromatic cut in rustic soups where the vegetables stay in the final dish.

Appears in

Fond brun (brown veal stock)Fond blanc (white veal or chicken stock)Court-bouillonBoeuf bourguignonCoq au vinNavarin d'agneauPot-au-feuSauce espagnole and its derivatives (demi-glace)

References

  1. 1.The Professional Chef, 9th ed. — The Culinary Institute of America (Wiley, 2011)
  2. 2.Larousse Gastronomique — Prosper Montagné, ed. (Larousse, 2009)
  3. 3.Escoffier: The Complete Guide to the Art of Modern Cookery — Auguste Escoffier (Wiley, 2011)
  4. 4.The French Laundry Cookbook — Thomas Keller (Artisan, 1999)
  5. 5.Sauces: Classical and Contemporary Sauce Making — James Peterson (Wiley, 2008)

Confidence: high

Notes

White vs. Brown Mirepoix

The distinction between white mirepoix (mirepoix blanc) and brown mirepoix (mirepoix brun) is fundamental to classical French stock-making. White mirepoix is used in fond blanc (white veal stock), fond de volaille (chicken stock), and fish velouté — it is either added raw and strained out, or sweated gently in butter without colour. Brown mirepoix is allowed to caramelise, developing Maillard reaction compounds that give fond brun and sauce espagnole their deep amber colour and roasted complexity. In white-mirepoix applications, carrot is either omitted or replaced with parsnip, leek, or celery root (celeriac) to avoid the orange pigment (beta-carotene) that would tint the stock.

The 2:1:1 Ratio and Its Variations

The classic French ratio — 2 parts onion, 1 part carrot, 1 part celery — reflects the relative flavour intensity of the three aromatics: onion is the dominant base, carrot adds sweetness and colour, and celery contributes an astringent herbal note that balances both. Kitchens adjust the ratio for specific outcomes: fish stocks often increase celery and reduce or eliminate carrot; poultry stocks sometimes add leek. The ratio also shifts geographically — Italian soffritto is sometimes equal parts of all three. Whatever the ratio, the essential principle holds: these three aromatics together create a broader, more rounded base flavour than any single aromatic alone, because their volatile aromatic compounds are chemically distinct and combine synergistically.

Mirepoix as Infrastructure, Not Ingredient

What distinguishes mirepoix from a vegetable dice used for eating is its role: it is infrastructure, not a dish element. In a stock, the mirepoix's job is to extract its water-soluble aromatic compounds into the liquid during the long simmer, then be discarded. This is why the cut size is deliberately rough — larger pieces release their aromatics more slowly and evenly over a multi-hour stock than finely cut pieces, which release quickly and can turn acrid or bitter if simmered too long. In braised dishes where the mirepoix stays in the pot and is served, it is typically cut smaller (closer to 1 cm) so it softens fully and integrates with the sauce.