Rich, comforting French classic with caramelized onions, savory broth, and golden melted Gruyère atop toasted baguette.
# What Goes In:
→ Onions
01 - 3 large yellow onions, thinly sliced
02 - 1 tablespoon unsalted butter
03 - 1 tablespoon olive oil
→ Soup Base
04 - 2 cloves garlic, minced
05 - 1 teaspoon sugar
06 - 1/2 teaspoon salt
07 - 1/4 teaspoon freshly ground black pepper
08 - 2 tablespoons all-purpose flour
09 - 1/2 cup dry white wine
10 - 5 cups beef or vegetable stock
11 - 2 sprigs fresh thyme
12 - 1 bay leaf
→ Topping
13 - 4 slices French baguette, 1 inch thick
14 - 1 tablespoon olive oil for bread
15 - 1 cup Gruyère cheese, grated
# How to Make It:
01 - In a large pot or Dutch oven, heat butter and olive oil over medium heat. Add sliced onions and stir to coat. Cook, stirring frequently, until onions are soft and deeply caramelized, about 35-40 minutes. Add sugar and salt halfway through to enhance caramelization.
02 - Add minced garlic and cook for 1 minute until fragrant.
03 - Sprinkle in flour and cook, stirring constantly, for 2 minutes to thicken slightly.
04 - Pour in white wine while scraping the bottom of the pot to release browned bits and develop depth of flavor.
05 - Add stock, thyme sprigs, and bay leaf. Bring to a simmer, reduce heat, and cook uncovered for 20-25 minutes. Remove thyme and bay leaf. Season with pepper and additional salt to taste.
06 - Preheat oven broiler. Arrange baguette slices on a baking sheet, brush both sides with olive oil, and toast under broiler until golden, approximately 1-2 minutes per side.
07 - Ladle hot soup into oven-safe bowls. Top each with a toasted baguette slice and cover generously with grated Gruyère cheese.
08 - Place filled bowls on a baking sheet and broil for 2-3 minutes until cheese is melted, bubbly, and golden brown. Serve immediately.
