French Onion Soup

March 30, 2026 Prep: 15min Cook: 75min 4 servings Easy
French Onion Soup

The secret to exceptional French onion soup is patience — caramelizing the onions slowly over low heat until they transform from sharp and pungent to sweet and deeply golden. This process takes at least 45 minutes, but the result is extraordinary.

Ingredients

  • 6 large yellow onions, thinly sliced
  • 60g unsalted butter
  • 1 tablespoon olive oil
  • 1 teaspoon sugar
  • 1 teaspoon salt
  • 3 tablespoons flour
  • 250ml dry white wine
  • 1.5 liters beef broth
  • 1 tablespoon fresh thyme leaves
  • 1 bay leaf
  • 4 thick slices of baguette, toasted
  • 200g Gruyère cheese, grated
  • Freshly ground black pepper

Nutrition Facts

380
Calories
18g
Protein
35g
Carbs
18g
Fat

Instructions

  1. 1
    Melt butter with olive oil in a large heavy pot. Add sliced onions, sugar, and salt. Cook over medium-low heat, stirring occasionally, for 45-60 minutes until deeply caramelized and golden brown.
  2. 2
    Sprinkle flour over the onions and stir for 2 minutes.
  3. 3
    Pour in white wine and scrape up any browned bits from the bottom. Let wine reduce by half.
  4. 4
    Add beef broth, thyme, and bay leaf. Simmer for 20 minutes.
  5. 5
    Ladle soup into oven-safe bowls. Top each with a toasted baguette slice and a generous mound of grated Gruyère.
  6. 6
    Broil for 3-4 minutes until cheese is golden, bubbling, and slightly charred. Serve immediately.
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