Classic French Onion Soup with Melted Gruyère
French Onion Soup
Rich, slow-cooked caramelized onions in a savory beef broth topped with gooey cheese.
Nutrition (per serving)
French onion soup is the ultimate testament to how time and care can turn simple ingredients into a masterpiece. The secret lies in the slow caramelization of the onions, drawing out their natural sugars until they reach a deep, savory sweetness that forms the backbone of the broth. There is no shortcut to that gorgeous mahogany color, but the reward is a soup with incredible depth and complexity.
Pairing that rich, savory broth with a crusty baguette slice and a bubbling blanket of melted Gruyère is the ultimate comfort food experience. It's the kind of dish that warms you from the inside out, making it perfect for a chilly evening or a special dinner party starter. This recipe brings that timeless Parisian bistro charm right to your home kitchen.
Ingredients
- Yellow onions, thinly sliced:3 lb
- Unsalted butter:4 tbsp
- Olive oil:2 tbsp
- Beef stock:6 cups
- Dry sherry or dry white wine:½ cup
- Garlic, minced:3 cloves
- Fresh thyme:2 sprigs
- Bay leaf:1 piece
- French baguette, sliced 1-inch thick:8 slices
- Gruyère cheese, shredded:1½ cups
- Salt:1 tsp
- Black pepper:½ tsp
Instructions
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In a large Dutch oven or heavy-bottomed pot, melt the butter and olive oil over medium heat.
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Add the sliced onions and cook, stirring occasionally, for about 45-50 minutes. The onions should become very soft and turn a deep, dark caramel brown. If they brown too quickly, lower the heat.
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Stir in the minced garlic and cook for just 1 minute until fragrant.
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Add the dry sherry to the pot to deglaze, using a wooden spoon to scrape up all the flavorful browned bits (fond) from the bottom.
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Pour in the beef stock, add the thyme sprigs and bay leaf, and bring the mixture to a gentle boil.
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Reduce the heat to low and simmer for 20-30 minutes to allow the flavors to meld. Remove the bay leaf and thyme sprigs before serving.
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While the soup simmers, toast the baguette slices in a 350°F oven until crisp and lightly golden.
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Preheat your broiler. Ladle the hot soup into four oven-safe bowls set on a sturdy baking sheet.
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Place two slices of toasted baguette on top of each bowl and generously cover with shredded Gruyère cheese.
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Broil for 2-4 minutes, or until the cheese is melted, bubbly, and has developed golden-brown spots. Serve immediately.
Tips & Notes
- Patience is key: Do not rush the onions. Real caramelization takes time and cannot be faked with high heat.
- For extra flavor, rub a raw garlic clove onto the toasted baguette slices before placing them on the soup.
- A splash of balsamic vinegar at the very end can add a lovely brightness to the rich broth.
