Soupe à l'Oignon Gratinée
Prep time: 20 minutes
Cook time: 1 hour 30 minutes
Total time: ~1 hour 50 minutes
Servings: 6 servings
Country of Origin
France (Paris)
Description
French Onion Soup is a legendary test of patience and technique. The soul of the dish lies in slowly cooking thinly sliced yellow onions over low heat for nearly an hour until their natural sugars break down, caramelizing them into a deep, mahogany-brown paste. Deglazed with dry white wine and sherry, then simmered in a rich, deeply savory beef stock, it is served in individual crocks topped with a toasted baguette slice and a mountain of bubbling, melted Gruyère cheese.
Presentation & How It's Eaten
Served piping hot in traditional oven-safe ceramic crocks. The soup must be baked under the broiler until the cheese forms a golden-brown, bubbling crust that drapes over the sides of the bowl. Diners break through the cheesy, bread-soaked crust with their spoons to reach the rich broth beneath.
Ingredients
1.5 kg (3.3 lbs) yellow onions, peeled and sliced paper-thin from pole to pole
4 tbsp unsalted butter
2 tbsp olive oil
1 tsp sugar (optional, to assist caramelization)
120 ml (1/2 cup) dry white wine
60 ml (1/4 cup) dry sherry or Cognac
1.5 liters (6 cups) high-quality, rich beef stock (preferably homemade)
2 sprigs fresh thyme
1 bay leaf
1 French baguette, sliced into 1-inch rounds
250g (2.5 cups) Gruyère or Comté cheese, grated
Salt and freshly cracked black pepper
Step-by-Step Directions
Caramelize the Onions (The Secret): In a large, heavy-bottomed Dutch oven, melt the butter and olive oil over medium-low heat. Add the sliced onions. Cook slowly, stirring occasionally. After 15 minutes, sprinkle with a pinch of salt and sugar. Continue cooking for another 45 to 60 minutes, adjusting the heat so the onions turn deep golden-brown, jammy, and sweet without burning.
Deglaze the Pot: Increase the heat to medium. Pour in the dry white wine and dry sherry, scraping up all the caramelized browned bits (fond) stuck to the bottom of the pot. Simmer for 3 to 4 minutes until the alcohol smell dissipates and the liquid is reduced by half.
Simmer the Broth: Pour in the rich beef stock, thyme sprigs, and bay leaf. Bring to a boil, then reduce the heat to low, cover, and let simmer gently for 30 minutes to allow the flavors to marry. Discard the herbs, then season with salt and pepper.
Toast the Baguette: While the soup simmers, preheat the oven to 200°C (400°F). Place the baguette slices on a baking sheet and bake for 6 to 8 minutes until completely dry and lightly toasted. (Dry bread prevents it from turning immediately to mush in the soup).
Assemble and Broil: Turn your oven to broiler mode. Ladle the hot soup into oven-safe crocks. Place 1 or 2 toasted baguette slices on top of each bowl, then cover the bread generously with grated Gruyère cheese, letting some spill over the edges.
Bake to a Bubble: Place the crocks on a sturdy baking sheet and slide under the broiler for 4 to 6 minutes, or until the cheese is bubbling, melted, and sports dark golden spots. Let cool for 5 minutes before serving.
Optional
Garlic Rub: Rub a raw garlic clove over the toasted baguette slices before placing them on the soup for a subtle aromatic punch.
Red Wine Variation: Substitute the dry white wine with a dry French red wine (like Pinot Noir) for a darker, more robust broth.
Cooking Tips
Slice Pole-to-Pole: Slicing the onions from root to stem (pole-to-pole) rather than across the grain helps them retain their structure during the long cooking process so they don't disintegrate.
Do Not Rush the Caramelization: There are no shortcuts to real caramelized onions. Adding sugar helps, but it still takes at least 45 minutes to develop the complex, sweet flavors necessary for a great soup.
Nutrition Facts
(Estimated per serving)
Calories: ~390 kcal
Total Fat: 18g
Saturated Fat: 10g
Cholesterol: 45mg
Sodium: ~780mg
Total Carbohydrates: 32g
Dietary Fiber: 4g
Sugars: ~9g
Protein: 18g
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