Serious Eats: Talk

Soup substitution help!

I'm visiting my parents for the holidays and I woke up to the instructions to "make soup". Well, there really isn't too many vegetables in the house - so I've decided on Bob Blumer's Gingered Carrot soup.

However, it calls for 3 leeks, which I don't have and cannot get. Can I substitute onions safely and if so how many should I use?

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