French Onion Soup
Caramelised onion broth under bubbling cheese toast.
About French Onion Soup
Onions are cooked low and slow until deeply caramelised, simmered in beef broth and topped with a raft of toasted bread and melted Gruyère browned under the grill. It is bistro comfort at its finest.
🏛️ History & Culture
The origins of French onion soup are genuinely debated, with folk tales linking it to figures like King Louis XV, but no single story is historically verified. What is clear is that onion soups have deep roots in French peasant cooking, where cheap onions, stale bread, and broth were simmered together for warmth. The modern, refined version—caramelised onions in beef stock crowned with toasted bread and bubbling cheese—emerged as a bistro staple in Paris, particularly as a late-night restorative after long evenings.
Regional variations across France are modest but notable: some cooks add white wine, brandy, or a splash of sherry to the broth, while cheese choices range from traditional Gruyère to Comté or Emmental, depending on local dairy traditions. The gratinéed croûte is essential, but the thickness of the bread and the depth of caramelisation vary from kitchen to kitchen. Culturally, the soup embodies thrift and comfort, transforming humble ingredients into a rich, indulgent dish that remains a proud symbol of French bistro dining worldwide.
🍳 How to make French Onion Soup
AI-assisted, not kitchen-testedFrench Onion Soup
Deeply caramelized onions simmered in rich beef broth, topped with toasted baguette and melted Gruyère – bistro comfort at its finest.
- Prep
- 15 min
- Cook
- 60 min
- Total
- 75 min
- Serves
- 4
- Difficulty
- Medium
Recipe ingredients
- 1 kg (2 lb 3 oz) yellow onions, thinly sliced
- 50 g (3½ tbsp) unsalted butter
- 1.5 litres (6 cups) beef broth, homemade or good-quality store-bought
- 1 loaf (about 7 oz) baguette, sliced into 2 cm / ¾ inch thick rounds
- 200 g (7 oz) Gruyère cheese, grated
- 4 sprigs fresh thyme
Steps
- 1 In a large heavy-bottomed pot, melt the butter over medium-low heat. Add the sliced onions and a pinch of salt (optional). Cook gently, stirring occasionally, for 40–50 minutes, until the onions are deeply caramelized and golden brown. If they start to stick, deglaze with a splash of water or broth.
- 2 Add the beef broth and fresh thyme sprigs. Bring to a simmer over medium heat, then reduce heat to low and let it gently simmer for 20–30 minutes. Season with salt and pepper to taste. Remove the thyme sprigs.
- 3 Preheat your grill/broiler to high. Toast the baguette slices lightly on both sides until just golden.
- 4 Ladle the hot soup into oven-proof bowls. Place a toasted baguette slice on top of each bowl (or float it). Sprinkle generously with the grated Gruyère.
- 5 Place the bowls under the hot grill for 2–3 minutes, until the cheese is melted, bubbly, and lightly browned. Serve immediately.
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