Mirepoix is the classic French aromatic combination of onion, carrot and celery. A common proportion is 2:1:1 by weight: twice as much onion as carrot, and the same weight of celery as carrot. The name identifies a flavor base used within a dish, rather than a complete recipe with one fixed cooking time.
What belongs in classic mirepoix?
The three vegetables are onion, carrot and celery. Other aromatics can join them in a particular recipe, but garlic, herbs and peppers are not automatically part of the classic trio. “Aromatics” is the broader category; mirepoix names one combination within it.
That distinction helps when reading an ingredient list. A recipe that says “add the aromatics” may mean ingredients it has already named. A recipe that says “400 g mirepoix” leaves a different question: does it specify its own blend, or expect the familiar onion-carrot-celery proportion? Check the surrounding directions before measuring.
How the 2:1:1 weight ratio works
There are four parts altogether: two plus one plus one. Divide the required total weight by four to find one part. Onion takes two of those parts; carrot and celery take one each. For 400 g total, that means 200 g onion, 100 g carrot and 100 g celery.
| Total mixture | Onion: 50% | Carrot: 25% | Celery: 25% |
|---|---|---|---|
| 200 g | 100 g | 50 g | 50 g |
| 400 g | 200 g | 100 g | 100 g |
| 600 g | 300 g | 150 g | 150 g |
These are scaling examples, not serving recommendations. A 600 g mixture is one and a half times the 400 g example, so every ingredient increases by the same factor. Doubling only the onion would change the balance instead of simply making a larger batch.
You can also work backward from an ingredient. If 75 g of carrot represents one part, the matching quantities are 150 g onion and 75 g celery, for 300 g altogether. This calculation assumes you want the conventional ratio; a recipe may deliberately specify something else.
Why vegetable counts and cupfuls differ
“Two onions, one carrot and one celery stalk” is a count ratio. It does not establish a weight ratio, because individual vegetables vary in size. Two small onions could weigh less than one large onion. A celery stalk and a whole bunch are also very different quantities.
Cups measure occupied space, including gaps between pieces. Equal cupfuls of onion, carrot and celery do not guarantee equal weights, and equal amounts would not describe the onion-heavy 2:1:1 balance anyway. Even two cups of onion to one cup each of carrot and celery is a volume version, not an exact weight conversion.
Keep the unit attached to the number when copying a recipe: “100 g celery” carries more information than “one part celery.” Follow the recipe’s stated measurement system rather than silently replacing grams with cups. A scale is useful when reproducing a weight proportion; precision here is about making the measurement clear, not proving that every dish requires laboratory accuracy.
White mirepoix and the Cajun trinity
White mirepoix avoids the orange color of carrot in pale preparations. One version described by the Culinary Institute of America uses equal amounts of onion, celery or celeriac, parsnip and leek. Recipes differ, so the name alone does not specify a universal replacement formula.
The Cajun trinity uses onion, celery and bell pepper. It is a related aromatic base with its own culinary context. Swapping pepper for carrot changes the ingredients and flavor; it should not be treated as a spelling variation of mirepoix.
Are soffritto and sofrito the same thing?
Italian soffritto often shares the onion-carrot-celery trio, but its preparation and additions depend on the dish. Spanish and Latin American sofrito covers varied combinations that can include onion, garlic, tomato, peppers or herbs. The similar names do not make these bases interchangeable ingredient lists.
For example, an instruction calling for a tomato-based sofrito cannot be fulfilled simply by weighing the three classic mirepoix vegetables. Read the recipe’s ingredient definition first. Escoffier’s aromatic-base overview provides a broader comparison of these traditions.
Let the intended dish determine the details
Cut size relates to cooking time and whether the vegetables remain in the finished dish or are removed. The same ingredient balance can serve different purposes. The Spruce Eats’ mirepoix reference discusses this distinction. A ratio supplies quantities; the recipe supplies the preparation and cooking method.
For checking ingredient weights, you can browse kitchen scales with gram measurements on Amazon. Look for a readable display and a tare function that excludes the bowl’s weight.
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