The Pantry Sauce Ludo Lefebvre Uses For The Best French Onion Soup - Tasting Table
Briefly

In a 2022 interview with Food & Wine, Lefebvre explains that adding a splash of Worcestershire to a simmering pan of onion soup "really brings back more flavors of the beef." This enhancement not only deepens the overall taste but also highlights the savory notes essential to French onion soup.
Adding a dash of Worcestershire sauce at the very end of the cooking time provides a boost of umami character to the soup, enhancing the beefy flavor of the stock used in the recipe.
The key to adding Worcestershire sauce is starting small, much like using soy or fish sauce. A few dashes will be sufficient to enliven dull stews and casseroles, bringing them to life.
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