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French Onion Soup

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A rich and comforting French Onion Soup with deeply caramelized onions, melty cheese, and toasty baguette—easy to make and packed with classic flavor.

Ingredients

4 pounds yellow onions, peeled and thinly sliced (about 56 large onions)

3 tablespoons butter

4 cloves garlic, minced

3 tablespoons flour

½ cup dry white wine

6 cups beef stock (or vegetable stock for vegetarian version)

1 teaspoon Worcestershire sauce

1 bay leaf

3 sprigs fresh thyme (or 1 teaspoon dried thyme)

Fine sea salt and freshly cracked black pepper, to taste

1 baguette, sliced into 1-inch thick rounds

2 cups grated or sliced cheese (Gruyère, Asiago, Swiss, Mozzarella, or Gouda)

Instructions

Caramelize the Onions
Melt butter in a large heavy-bottomed pot over medium-high heat. Add onions and sauté for about 30 minutes, stirring frequently toward the end, until caramelized and golden. Add garlic and cook for another 2 minutes.

Deglaze and Add Flour
Stir in flour and cook for 1 minute, then pour in wine, deglazing the pan and scraping up browned bits with a wooden spoon.

Simmer the Soup
Add stock, Worcestershire, bay leaf, and thyme. Bring to a simmer. Reduce heat to medium-low, cover, and simmer for 10–15 minutes. Remove bay leaf and thyme sprigs. Season to taste with salt and pepper.

Toast the Baguette
Preheat oven to 400°F (200°C). Arrange baguette slices on a baking sheet and toast for 6–8 minutes, until golden.

Broil and Finish
Switch oven to broil. Ladle hot soup into oven-safe bowls placed on a baking sheet. Top each with a toasted baguette slice and ¼ cup shredded cheese. Broil for 2–4 minutes until cheese is melted and bubbly. Serve immediately.

Notes

Oven-Safe Bowls: Always check your bowl’s oven safety before broiling. If unsure, reduce the broil temperature or melt cheese separately on baguette slices.

Vegetarian Version: Use vegetable broth and a vegetarian-friendly Worcestershire sauce.

Make Ahead: The soup base can be made 1–2 days ahead and reheated before topping and broiling.