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Soupe à l’Oignon Gratinée

Name: Soupe à l’Oignon Gratinée
Prep time: 20 min
Cook time: 80 min
Yield: 6
Ingredients: 2 ½ lb yellow onions, thinly sliced; 4 tbsp butter; 1 tbsp olive oil; 1 tsp sugar; 2 tbsp all-purpose flour; 6 cups beef stock; ½ cup dry white wine; 1 baguette, sliced and toasted; 2 cups grated Gruyère cheese; 1 bay leaf; 2 sprigs fresh thyme; ½ tsp salt; ½ tsp black pepper

The Parisian bistro classic — deeply caramelized onions in rich broth, topped with toasted bread and melted cheese.

⏱ 20 minPrep time

🔥 1 hr 20 minCook time

🍽 6Servings

🏷 French KitchenCategory

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Soupe à l’Oignon Gratinée is the Parisian bistro classic: onions caramelized slowly until deep amber, simmered into a rich beef broth, then crowned with toasted bread and a blanket of bubbling Gruyère. It is humble ingredients, treated with patience.

Traditionally served in ovenproof bowls that go under the broiler, it has warmed late-night diners for generations. Serve it very hot, with the cheese pulling in long strands and crusty bread underneath to soak up every spoonful.

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Step by stepInstructions

Melt the butter and oil in a heavy pot and cook the onions with the bay leaf and thyme over low heat for 40 to 45 minutes, stirring often, until deeply golden.
Sprinkle in the sugar and flour and cook 2 minutes more.
Pour in the wine, scraping up the browned bits, then add the stock. Simmer 30 minutes; season with salt and pepper.
Ladle the soup into ovenproof bowls and float toasted baguette slices on top.
Pile the Gruyère over the bread and broil 3 to 4 minutes, until bubbling and browned. Serve immediately.

💡 Chef tips & storage

Don't rush the onions — deep caramelization is the entire flavor of this soup. Use ovenproof bowls and keep an eye on the broiler.

Recipe details

Prep20 min

Cook1 hr 20 min

Servings6

CategoryFrench Kitchen

PublishedAugust 17, 2026

Hi, I'm Emily 🧡

Hi, I'm Emily — the cook behind My Comfort Recipes. Simple, tested comfort food for real weeknights, written down the way grandma would. Pull up a chair. More about me →

Soupe à l’Oignon Gratinée

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Soupe à l’Oignon Gratinée

Step by stepInstructions

💡 Chef tips & storage

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Hi, I'm Emily 🧡

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