Soupe à l’Oignon Gratinée des Halles (Parisian Caramelized Onion Soup with Gruyère Crouton) – Authentic France Recipe

Ingredients for Soupe à l’Oignon Gratinée des Halles (Parisian Caramelized Onion Soup with Gruyère Crouton) (4 Servings)

• 1.25 lbs (or 2.5 cups) 5 large yellow onions slow-caramelized, prepped into bite-sized pieces
• 1.5 cups toasted baguette slices, washed and trimmed
• 1 cup bubbling aged Gruyère cheese
• 1 medium onion and 3 cloves garlic, finely minced with fresh thyme
• 1.5 tbsp traditional France seasoning (dry white wine/sherry splash, bay leaf, rich broth)
• 2.5 cups rich culinary stock or aromatic cooking liquid, plus 2 tbsp cooking oil

Step-by-Step Cooking Instructions

1. Warm cooking oil in a heavy pot over medium heat; gently sweat the minced onion, garlic, and fresh thyme for 3–4 minutes until fragrant.
2. Stir in dry white wine/sherry splash, bay leaf, rich broth and toast for 45 seconds to release the essential oils of France's kitchen.
3. Add 5 large yellow onions slow-caramelized and toasted baguette slices, tossing to coat in the aromatic base.
4. Pour in the stock, bring to a gentle boil, then reduce heat and simmer covered for 18–20 minutes until tender and deeply flavorful.
5. Fold in bubbling aged Gruyère cheese, adjust seasoning, and ladle steaming hot into deep bowls.