Mirepoix is:
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The ratio is 50% onion, 25% carrots, and 25% celery.
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The ratio is 50% carrots, 25% onion, and 25% celery.
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The ratio is 50% onion, 50% carrots.
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It is nothing.
Mirepoix is a French culinary preparation of diced vegetables cooked with butter or oil. The classic ratio is 2:1:1 (50% onion, 25% carrots, 25% celery by volume). This aromatic vegetable base forms the foundation of many soups, stews, sauces, and braises in French cuisine. It's pronounced 'meer-pwah'.
Mirepoix is the classic French aromatic base made from a 2:1:1 ratio of onion to carrot to celery — that is, 50% onion and 25% each of carrots and celery, by weight. This specific ratio (not 50/50 or 50/25/25 with carrots as the majority) is what defines mirepoix as distinct from similar aromatic bases in other cuisines.