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French Onion Soup is a classic dish known for its rich flavors and comforting warmth. Using sous vide cooking techniques enhances the depth of flavor and ensures perfectly tender onions and a delicious broth. This recipe combines traditional ingredients with modern sous vide methods to create an unforgettable soup featuring melted Gruyère cheese.
Ingredients
- 4 large yellow onions, thinly sliced
- 2 tablespoons olive oil
- 4 cups beef or vegetable broth
- 1 teaspoon thyme
- 2 bay leaves
- Salt and pepper to taste
- 8 slices of baguette
- 1 ½ cups grated Gruyère cheese
- Optional: a splash of dry white wine
Preparation Steps
Start by caramelizing the onions. In a large skillet, heat olive oil over medium heat. Add sliced onions, a pinch of salt, and cook slowly, stirring occasionally, until they are deeply caramelized, about 30-40 minutes. This step develops the rich sweetness essential for the soup.
Transfer the caramelized onions to a vacuum-sealable bag. Add the thyme, bay leaves, and a splash of white wine if desired. Seal the bag tightly, removing as much air as possible.
Set your sous vide cooker to 85°C (185°F). Submerge the bag in the water bath and cook for 1.5 hours. This gentle cooking process ensures the onions become tender and flavorful.
Meanwhile, preheat your oven’s broiler. Toast baguette slices until golden brown. Set aside.
Once the sous vide process is complete, carefully remove the bag and transfer the onion mixture to a pot. Discard the bay leaves. Warm the mixture over medium heat, adding broth to reach your desired soup consistency. Season with salt and pepper.
Ladle the hot soup into oven-safe bowls. Place a toasted baguette slice on top of each, then generously sprinkle with grated Gruyère cheese. Place the bowls under the broiler until the cheese is melted and bubbly, about 2-3 minutes.
Serving and Tips
Serve the soup hot, garnished with fresh herbs if desired. The sous vide method enhances the sweetness and ensures perfectly tender onions, making this French Onion Soup a delightful twist on the traditional recipe. For extra flavor, consider adding a splash of sherry or balsamic vinegar before serving.