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Unlock Soup Flavor: Master the Art of Caramelizing Onions

1/16/2026

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Summary

Story summary

Caramelizing onions significantly enhances soup flavors, with yellow onions preferred for balance; shallots and sweet varieties also work.
The technique requires cooking onions slowly for 30 to 45 minutes to develop a sweet, savory base.
Editorial Director Carolyn Malcoun recommends cooking onions until colored before adding mirepoix to avoid overcooking.
For richer soups, such as Thomas Keller's Onion Soup, onions may caramelize for up to five hours, yielding depth.

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Story summary

Caramelizing onions significantly enhances soup flavors, with yellow onions preferred for balance; shallots and sweet varieties also work.
The technique requires cooking onions slowly for 30 to 45 minutes to develop a sweet, savory base.
Editorial Director Carolyn Malcoun recommends cooking onions until colored before adding mirepoix to avoid overcooking.
For richer soups, such as Thomas Keller's Onion Soup, onions may caramelize for up to five hours, yielding depth.