The Unique Ingredient That Adds Rich Flavor To French Onion Soup - Tasting Table
Briefly

When it comes to French onion soup, adding duck fat not only enhances the flavor but also enriches the overall dish with a creamy consistency and additional umami.
Duck fat offers a sweetness that builds on the caramelization of the onions, bringing a complex and delightful richness to French onion soup.
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