Classic French Onion Soup Recipe
Imagine sinking your spoon into a steaming bowl of French Onion Soup, the aroma of caramelized onions filling the kitchen, and a blanket of gooey, golden cheese stretching as you lift the spoon. Every bite delivers deep, savory richness, a perfect harmony of sweet onions and hearty broth.
Ingredients
- 4 large yellow onions, thinly sliced
- 3 tablespoons unsalted butter — adds richness and helps caramelize onions evenly.
- 1 tablespoon olive oil — prevents sticking and adds subtle flavor.
- 2 cloves garlic, minced
- 1 teaspoon sugar — accelerates caramelization.
- 1 teaspoon salt
- 1/4 teaspoon black pepper
- 2 tablespoons all-purpose flour — thickens the soup slightly.
- 1 cup dry white wine
- 6 cups beef broth (or vegetable broth for vegetarian option)
- 1 teaspoon fresh thyme leaves
- 1 bay leaf
- Baguette slices, toasted
- 1 1/2 cups grated Gruyère cheese
Ingredient Spotlights
Yellow onions — Sweet and mellow, they caramelize perfectly for depth of flavor. Gruyère cheese — Melts beautifully and adds nutty, savory notes.
Substitutions
- Vegetarian: Replace beef broth with vegetable broth.
- Cheese: Swap Gruyère with Swiss or Mozzarella for a milder flavor.
- Gluten-free: Use gluten-free flour or cornstarch as thickener.
Kitchen Tools
- Heavy-bottomed Dutch oven — Ensures even heat for slow caramelization.
- Wooden spoon — Ideal for stirring onions without mashing them.
- Oven-safe soup bowls — Perfect for broiling cheese without mess.
Instructions
- In a heavy-bottomed Dutch oven, melt butter with olive oil over medium heat.
- Add sliced onions, sprinkle with sugar and salt, and cook for 30–40 minutes, stirring occasionally, until deeply caramelized. Patience is key for rich flavor.
- Stir in garlic and cook for 1 minute until fragrant.
- Sprinkle flour over onions and cook 2 minutes to eliminate raw taste.
- Add wine, scraping up browned bits from the bottom.
- Pour in beef broth, add thyme and bay leaf. Simmer for 20 minutes.
- Preheat broiler. Ladle soup into oven-safe bowls, top with toasted baguette slices and grated Gruyère.
- Broil until cheese is bubbly and golden, 3–5 minutes. Serve immediately.
Tips & Troubleshooting
- Onion not caramelizing? Lower heat slightly and stir more frequently.
- Soup too thin? Simmer longer uncovered to reduce and intensify flavor.
- Cheese not melting evenly? Ensure broiler is fully preheated and bowls are oven-safe.
Storage
- Refrigerate: Soup (without cheese) up to 3 days in airtight containers.
- Freeze: Soup (without cheese) up to 2 months. Thaw overnight in fridge before reheating.
- Baguette slices and cheese are best added fresh before serving.
Serving Suggestions
Pair with a crisp green salad or roasted vegetables. A glass of dry white wine complements the rich, savory flavors beautifully.
FAQ
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