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Soupe à l'Oignon Gratinée

This classic French onion soup, topped with melted Gruyère cheese and served with crusty bread, offers a rich and comforting warmth that's perfect for any weeknight dinner.
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Prep Time 15 minutes
Cook Time 1 hour 10 minutes
Total Time 1 hour 25 minutes
Servings: 6 servings
Course: Appetizer, Soup
Cuisine: French
Calories: 450
Ingredients Method Notes

Ingredients
  

Main Ingredients
  • 6 large large onions, thinly sliced Use fresh, high-quality onions for sweetness.
  • 4 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 1 teaspoon sugar
  • 4 cups beef broth For a vegetarian option, consider vegetable broth.
  • 1 cup dry white wine
  • 1 teaspoon thyme
  • to taste Salt and pepper
  • 1 baguette sliced Gluten-free bread is a great substitute.
  • 2 cups grated Gruyère cheese Consider Swiss or dairy-free cheese as alternatives.

Method
 

Preparation
  1. In a large pot, melt the butter with olive oil over medium heat.
  2. Add the sliced onions and sugar, cooking while stirring frequently until the onions are caramelized and golden brown, which will take about 30 minutes.
  3. Pour in the dry white wine and let it simmer for about 10 minutes, allowing the liquid to reduce and thicken slightly.
  4. Add the beef broth and thyme to the pot, then season with salt and pepper to taste.
  5. Bring the soup to a boil, then reduce the heat and let it simmer for an additional 30 minutes.
  6. Preheat your broiler and ladle the soup into oven-safe bowls.
  7. Top each bowl with a slice of baguette and a generous amount of Gruyère cheese.
  8. Broil the bowls until the cheese is bubbly and golden brown, keeping a close eye to prevent burning.
  9. Serve hot and enjoy your delicious Soupe à l'Oignon Gratinée!

Notes

Serve the soup with a fresh green salad and pair it with red wine for a perfect meal. Store leftovers in an airtight container in the refrigerator for up to 3 days or freeze for up to 2 months.