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#### **Step 1: Caramelize the Onions**
1. In a large pot or Dutch oven, heat the butter and olive oil over medium heat.
2. Add the sliced onions to the pot and stir to coat with the butter and oil.
3. Cook the onions, stirring occasionally, for about 30-40 minutes. The key to the perfect French Onion Soup is to caramelize the onions slowly, so they become soft, golden, and sweet. Don’t rush this step – the longer you cook the onions, the deeper the flavor.
4. Stir occasionally to prevent the onions from burning, scraping the bottom of the pot to release any caramelized bits.
#### **Step 2: Deglaze the Pot**
1. Once the onions are deeply caramelized, pour in the white wine (if using) to deglaze the pot, scraping the browned bits from the bottom. Let the wine simmer for about 2 minutes to reduce slightly.
#### **Step 4: Prepare the Toasted Bread**
1. While the soup is simmering, preheat your oven to 400°F (200°C). Place the slices of baguette on a baking sheet.
2. Toast the bread in the oven for about 5-7 minutes, or until golden and crispy. You can also rub the toasted bread with a clove of garlic for added flavor.
#### **Step 5: Assemble and Broil**
1. Ladle the hot soup into oven-safe bowls (crocks or soup bowls work well).
2. Place a slice of toasted bread on top of each bowl of soup, then generously sprinkle with Gruyère and Swiss cheese.
3. Place the bowls under the broiler for 3-5 minutes, or until the cheese is melted, bubbly, and golden brown. Keep a close eye on them to prevent burning.
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The secret to this Best French Onion Soup lies in the caramelized onions. Slow-cooking them to golden perfection brings out their natural sweetness, which balances beautifully with the richness of the beef broth and the slight acidity of the wine. The cheese and bread topping, perfectly melted and crispy, adds a layer of indulgence that takes this soup from delicious to extraordinary.
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### **Tips for Perfect French Onion Soup**
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### **Serving Suggestions**
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There’s nothing quite like the warmth and heartiness of a bowl of homemade French Onion Soup. With its deep, savory flavor, gooey cheese, and crispy bread topping, this dish is guaranteed to become a favorite in your recipe collection. Whether you’re making it for a cozy weeknight dinner or serving it at a dinner party, the Best French Onion Soup will always be a crowd-pleaser.
Try this recipe next time you’re in the mood for something hearty and comforting, and savor every delicious spoonful of this classic French dish!