Classic French Onion Soup

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Step-by-Step Guide to Classic French Onion Soup

Making French onion soup requires patience, especially when caramelizing onions. Here’s how to achieve perfect flavor:

Step 1: Slice the Onions

• Peel and slice onions thinly and evenly to ensure uniform caramelization.

Step 2: Caramelize the Onions

1. Heat butter and oil in a large, heavy-bottomed pot over medium heat.
2. Add onions and stir to coat.
3. Cook slowly, stirring occasionally for 30–45 minutes.
4. The onions should turn deep golden brown, sweet, and soft.
5. Avoid high heat; burning will create bitterness.

Step 3: Deglaze the Pan

• Add wine to deglaze the pot, scraping up the brown bits from the bottom.
• Simmer for 2–3 minutes until alcohol evaporates.

Step 4: Add Broth and Seasonings

• Pour in beef or vegetable broth.
• Add thyme, bay leaves, salt, and pepper.
• Simmer for 20–30 minutes to allow flavors to meld.

Step 5: Prepare the Bread

• Slice baguette into rounds.
• Toast until golden brown for a crispy base under the cheese.

Step 6: Assemble the Soup

1. Preheat your oven to broil.
2. Ladle soup into oven-safe bowls.
3. Place a slice of toasted bread on top.
4. Generously sprinkle with grated Gruyère cheese.

Step 7: Broil

• Place bowls under the broiler for 2–5 minutes until the cheese is melted and bubbly.
• Watch carefully to prevent burning.

Step 8: Serve

• Serve immediately, garnished with fresh thyme if desired.

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Tips for Perfect Caramelized Onions

• Be patient: True caramelization takes time.
• Stir occasionally: Prevents sticking or burning.
• Use a heavy-bottomed pot: Distributes heat evenly.
• Add a pinch of sugar (optional): Enhances natural sweetness.
• Deglaze properly: Wine or broth lifts the fond (browned bits) for extra flavor.

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Variations and Twists

French onion soup can be adapted to suit different tastes:

Vegetarian French Onion Soup

• Use vegetable broth instead of beef broth.
• Add a splash of soy sauce for umami depth.

French Onion Soup with Cognac

• Add a tablespoon of cognac or brandy before adding broth for a subtle, sophisticated flavor.

Spicy Twist

• Include a pinch of red pepper flakes or smoked paprika for heat.

Gourmet Version

• Add caramelized shallots or leeks for complexity.
• Use a mix of Gruyère and Comté cheese for extra depth.

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Health Benefits of French Onion Soup

While indulgent, French onion soup can offer nutritional value:

Onions

• Rich in antioxidants and vitamin C
• Support heart health and immune function

Broth

• Provides minerals and protein (if using beef broth)
• Hydrating and soothing

Cheese

• Source of calcium and protein
• Adds healthy fats for satiety

Optional Adjustments

• Reduce butter or use olive oil for lighter versions
• Opt for whole-grain or lower-sodium bread
• Use lower-fat cheese if desired