Mirepoix (pronounced as Mir-pwa) is a French (if I'm not mistaken!) term to describe a combination of onions, carrots and celery. It is commonly used as a base ingredients to add flavour to soups, stews, and sauces, either used raw, buttered or roasted.
The other combination consisting of capsicum, celery and onions is known as Trinity. It is not so common in comparison to Mirepoix.
For both cases, you can use any types of onions but I chose red onions over others because it has a stronger taste and mildly sweet unlike yellow onions which are too sweet but good for onion soups. Celeriac could be used in place of celery and there is of course no substitute for carrots.
As for proportions, many said that it is a 1:1:1 ratio but I have always use a 2:1:1 ratio. As simple as it might sound, all you need is a food processor or a blender to make this. Believe it or not, 1 celery and 1 carrot each is half the weight of one red onion!
So, in my opinion, the 1:1:1 ratio is not referring to weight, but the number of each of them is used.
That's just my two cents and now everyone knows what's mirepoix :)
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