French Onion Soup (Printer-Friendly)

Savory French soup with caramelized onions, rich beef broth, and melted Gruyère on crusty baguette.

# What You Need:

→ Alliums

01 - 4 large yellow onions, thinly sliced
02 - 2 large leeks, white and light green parts only, cleaned and thinly sliced
03 - 3 shallots, thinly sliced
04 - 3 garlic cloves, minced

→ Fats

05 - 3 tablespoons unsalted butter
06 - 2 tablespoons olive oil

→ Broth & Umami

07 - 8 cups high-quality beef broth
08 - 1 tablespoon Worcestershire sauce
09 - 2 teaspoons soy sauce
10 - 1/2 cup dry white wine
11 - 2 teaspoons fresh thyme leaves
12 - 1 bay leaf

→ Bread & Cheese

13 - 1 baguette, sliced into 1/2-inch rounds
14 - 2 cups Gruyère cheese, grated
15 - 1/2 cup Parmesan cheese, grated

→ Seasonings

16 - Salt and freshly ground black pepper, to taste

# Steps:

01 - In a large heavy-bottomed pot or Dutch oven, heat the butter and olive oil over medium heat.
02 - Add the sliced onions, leeks, and shallots. Sauté, stirring frequently, until very soft and deep golden brown, approximately 35-40 minutes. Add the minced garlic and cook for 2 minutes more.
03 - Deglaze the pot with white wine, scraping up any browned bits from the bottom.
04 - Stir in the beef broth, Worcestershire sauce, soy sauce, thyme, and bay leaf. Bring to a simmer. Reduce heat and cook uncovered for 30 minutes, stirring occasionally.
05 - Season with salt and pepper to taste. Remove the bay leaf.
06 - Preheat the oven broiler to high heat.
07 - Arrange baguette slices on a baking sheet and toast under the broiler until golden, approximately 1-2 minutes per side.
08 - Ladle the hot soup into oven-safe bowls. Top each with toasted baguette slices and a generous amount of Gruyère cheese.
09 - Place bowls under the broiler until the cheese is melted and bubbly, approximately 3-5 minutes.
10 - Serve immediately, garnished with extra thyme if desired.

# Expert Suggestions:

01 -
  • The caramelization takes patience, but the payoff is pure comfort in a bowl with layers of flavor that sneak up on you.
  • It's the kind of dish that makes people feel cared for, especially when they taste that first spoonful of melted Gruyère stretching from the spoon.
  • Once you nail the technique, you'll find yourself making it for every gathering because it feels both elegant and deeply satisfying.
02 -
  • The caramelization cannot be rushed—low and slow is the only way to get those deep, complex flavors that make this soup worth the time.
  • Use oven-safe bowls or your soup bowls will crack under the broiler; I learned this by having to remake the whole dish.
  • Day-old baguette toasts much better than fresh bread, which tends to stay slightly chewy in the middle.
  • The cheese will continue cooking even after you pull it from the broiler, so stop when it looks slightly underdone—it'll reach perfect bubbly consistency as you carry it to the table.
03 -
  • For extra depth, add a splash of sherry or cognac when you deglaze instead of just white wine—it brings an elegant richness that makes people ask what your secret ingredient is.
  • If Gruyère is out of reach or budget, Emmental or even a sharp white cheddar will work, though Gruyère's nutty character is genuinely worth seeking out for this dish.
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