In 2019, French chef and culinary star Ludo Lefebvre spoke with Food & Wine and shared key pointers for making the perfect bowl of French onion soup.

Some of Lefebvre's tips for the classic dish are straightforward, but one tip he mentioned that will elevate your French onion soup is adding Worcestershire sauce.

Talking about the interesting addition, the chef noted, "It really brings back more flavors of the beef." This is true, given that the sauce is often paired with beef-based foods.

A certified umami booster, the dark and savory Worcestershire sauce typically consists of a vinegar base and contains molasses, anchovies, onion, tamarind, and garlic.

When it comes to French onion soup, the vinegar adds tanginess, the molasses add a sweetness that enhances the caramelized onions, and the anchovies bring out the beefy flavors.