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Cozy French Onion Soup Recipe Easy Homemade Gruyere Crostini Guide

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A comforting French onion soup featuring slowly caramelized onions, rich beef broth, and melty Gruyere crostini, perfect for cozy nights and gatherings.

Ingredients

Scale
  • 4 large yellow onions, thinly sliced
  • 3 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 8 cups (1.9 liters) beef broth
  • 1 cup (240 ml) dry white wine (optional)
  • 2 garlic cloves, minced
  • 2 teaspoons fresh thyme, chopped
  • 2 bay leaves
  • Salt and freshly ground black pepper, to taste
  • 1 baguette, sliced into 1/2-inch rounds
  • 1 1/2 cups shredded or sliced Gruyere cheese

Instructions

  1. Peel and slice 4 large yellow onions thinly (about 1/8 inch or 3 mm).
  2. In a large heavy-bottomed pot or Dutch oven, melt 3 tablespoons unsalted butter with 1 tablespoon olive oil over medium heat. Add sliced onions and stir to coat well.
  3. Cook onions, stirring every few minutes, for about 25-30 minutes until deep golden brown, adding a splash of water if they start to stick.
  4. Stir in 2 minced garlic cloves, 2 teaspoons fresh thyme, and 2 bay leaves. Cook for 2 minutes until fragrant.
  5. Pour in 1 cup dry white wine, scraping up browned bits from the bottom. Simmer until reduced by half, about 5-7 minutes. If skipping wine, proceed to next step.
  6. Add 8 cups beef broth. Season with salt and freshly ground black pepper to taste. Bring to a gentle boil, then reduce heat and simmer uncovered for 20-25 minutes.
  7. Preheat oven to 375°F (190°C). Arrange baguette slices on a baking sheet and toast for 5-7 minutes until golden and crisp. Remove and set aside.
  8. Top each toasted baguette slice with shredded Gruyere cheese. Place under broiler on a baking sheet until cheese melts and bubbles, about 2-3 minutes. Watch closely to avoid burning.
  9. Ladle hot soup into oven-safe bowls. Place one or two Gruyere crostini on top of each bowl. Optionally broil assembled bowls for 1-2 minutes to melt cheese further. Remove bay leaves before serving.

Notes

Caramelizing onions requires patience; cook slowly over medium heat to avoid bitterness. Use freshly shredded Gruyere for best melting. Toast bread until crisp to prevent sogginess. For vegetarian version, substitute beef broth with vegetable broth and omit wine.

Nutrition

Keywords: French onion soup, Gruyere crostini, caramelized onions, comfort food, easy soup recipe, cozy dinner

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