French Onion Soup

Caramelized Onion • Gruyère Crouton — France

Five onions and one hour of patience, transformed into the deepest, sweetest soup in French cooking — crowned with a Gruyère crouton that stretches to the ceiling. The caramelization cannot be rushed; it can only be respected.

Ingredients

• 1000 g — Yellow onions, thinly sliced (about 5 large)
• 45 g — Butter (3 Tbsp)
• 120 ml — Dry white wine (½ cup)
• 1500 ml — Good vegetable or beef stock (6 cups)
• 4 g — Fresh thyme + bay leaf
• 8 g — All-purpose flour (1 Tbsp)
• 120 g — Baguette, in thick slices
• 200 g — Gruyère, grated (2 cups)
• 4 g — Granulated sugar (1 tsp, optional)

Step-by-Step Method

1. Caramelize — the whole recipe. Onions, butter and a pinch of salt in a heavy pot over medium-low. Stir every few minutes for 45–55 minutes. They go soft, then blonde, then amber, then deep mahogany. If they stick, a splash of water and scrape — those brown bits are the flavor. Add the sugar only if your onions lack sweetness.
2. Deglaze with wine. Flour stirred in for 1 minute, then the wine, scraping the pot clean. Let it bubble away almost completely — you want the aroma, not the alcohol.
3. Simmer the soup. Stock, thyme and bay in. Simmer 20 minutes, skim any fat, season boldly. The soup should taste intensely oniony-sweet with a savory backbone.
4. The gratinéed crown. Ladle into oven-safe bowls. A baguette slice (toasted first, so it floats instead of sinking) on each, buried under Gruyère. Broil 3–4 minutes until blistered and bubbling. Rest 2 minutes — it is molten lava under that crust.

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