French Onion Soup is a warm, savory, and comforting soup with caramelized onions, rich broth, and a cheesy toasted topping. This easy version simplifies the process but keeps the deep, sweet flavor of traditional French onion soup.
Ingredients (Serves 4)
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4 large onions, thinly sliced
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3 tablespoons butter
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1 tablespoon olive oil
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1 teaspoon sugar (helps caramelize onions)
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3 cloves garlic, minced
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4 cups beef or vegetable broth
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1 teaspoon Worcestershire sauce (optional)
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Salt and pepper, to taste
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4 slices of baguette or crusty bread
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1 cup grated Gruyère or Swiss cheese
Instructions
1. Caramelize the Onions
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In a large pot, melt butter with olive oil over medium heat.
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Add sliced onions and sugar.
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Cook slowly for 20–25 minutes, stirring occasionally, until onions are deep golden brown and sweet.
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Add minced garlic in the last 2 minutes of cooking.
2. Make the Soup
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Pour in the broth and Worcestershire sauce (if using).
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Stir well and bring to a gentle simmer.
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Season with salt and pepper to taste.
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Let simmer for 10–15 minutes to develop flavor.
3. Prepare the Bread Topping
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Preheat oven to 375°F (190°C).
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Place baguette slices on a baking sheet and toast lightly until slightly crisp.
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Spoon soup into oven-safe bowls, place a slice of bread on top, and sprinkle with grated cheese.
4. Broil & Serve
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Place bowls under the broiler for 2–4 minutes, until cheese is melted and bubbly.
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Serve immediately—caution, bowls will be hot!
Tips for Best French Onion Soup
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Use yellow or sweet onions for best caramelization.
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Cook onions slowly; don’t rush the caramelization process.
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Gruyère cheese melts beautifully and adds authentic flavor.
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For vegetarian version, use vegetable broth instead of beef broth.
Variations
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Sherry or White Wine: Add ¼ cup for extra depth.
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Herbs: Thyme or bay leaves enhance flavor during simmering.
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Mini Soup Bowls: Make individual servings for parties or brunch.