Classic French Onion Soup with Gruyère Croutons
This classic French Onion Soup is inspired by the rich culinary heritage of France, dating back to the 18th century. Renowned for its beautifully caramelized onions, sherry-infused broth, and melty Gruyère cheese topping, this dish epitomizes the elegance and comfort of French cuisine.
Equipment
- Large heavy-bottomed pot or Dutch oven (5-6 quart / 5-6 litre)
- Wooden spoon or heat-resistant spatula
- Oven-safe soup bowls or crocks
- Baking sheet
- Cheese grater or box grater
- Ladle
- Instant-read thermometer (optional — for checking broth temperature when reheating)
Ingredients
- 3 tbsp unsalted butter 45g, preferably European-style for richer flavour
- 6 medium yellow onions thinly sliced, about 3.3 lbs / 1.5kg
- 1 tsp sugar to aid caramelization
- 2 tbsp all-purpose flour 16g
- ½ cup dry sherry 120ml, or dry white wine as an alternative — increase to 3/4 cup (180ml) for a stronger sherry flavour
- 6 cups beef stock 1.4 litres, preferably homemade or low-sodium
- 1 bay leaf fresh or dried
- 2 sprigs fresh thyme or 1/2 teaspoon (1 gram) dried thyme
- 4 slices baguette cut 3/4-inch (2cm) thick, toasted until golden
- 1 cup Gruyère cheese 100g, grated
- salt to taste
- ground black pepper freshly ground
Instructions
- In a large, heavy-bottomed pot or Dutch oven, melt the butter over medium heat. Add the sliced onions, sugar, and a generous pinch of salt. Stir to coat the onions thoroughly with the butter.3 tbsp unsalted butter, 6 medium yellow onions, 1 tsp sugar, salt
- Continue to cook the onions for about 25 to 30 minutes, stirring occasionally, until they are deeply golden and caramelized. You'll notice a sweet, nutty aroma.
- Sprinkle the flour over the onions, stirring constantly to avoid lumps, and cook for another 3 minutes to remove any raw flour taste.2 tbsp all-purpose flour
- Deglaze the pot with the sherry, gently scraping any browned bits from the bottom of the pan, and let it simmer for 5 minutes until slightly reduced.1/2 cup dry sherry
- Add the beef stock, bay leaf, and thyme sprigs (or dried thyme). Bring to a gentle simmer, then reduce heat to low and cover the pot. Let it simmer for 20 minutes to meld flavours. Remove the bay leaf and thyme sprigs before serving. Season with salt and freshly ground black pepper to taste.6 cups beef stock, 1 bay leaf, 2 sprigs fresh thyme, salt
- While the soup simmers, preheat your oven's broiler (grill) to high, positioning a rack about 6 inches (15cm) from the heating element. Place toasted baguette slices in oven-safe bowls or crocks, ladle the hot soup over them, and top each bowl with a generous mound of grated Gruyère cheese.4 slices baguette, 1 cup Gruyère cheese
- Place the bowls on a baking sheet for stability and broil for 3-5 minutes, watching closely, until the cheese is bubbling and golden brown in spots. Serve immediately — the bowls will be extremely hot, so warn your guests.
Notes
Storage: Cool the broth (without bread and cheese) completely, then refrigerate in an airtight container for up to 4 days or freeze for up to 3 months. Reheat gently on the stovetop over medium-low heat.
Make-ahead: Caramelize the onions up to 3 days ahead and refrigerate separately. On serving day, reheat onions in the pot, add stock, simmer, and assemble — cutting active time to about 30 minutes.
Substitutions: Swap dry sherry for dry white wine (Sauvignon Blanc works well). For a vegetarian version, use rich mushroom or vegetable stock. Swiss cheese can replace Gruyère in a pinch, though the flavour will be milder.
Pro tip: Do not assemble bowls with bread and cheese until you are ready to serve. Stored assembled, the bread turns to paste and the cheese goes rubbery.
Broiler alternative: If you don't have oven-safe bowls, broil the cheese-topped baguette slices on a baking sheet, then slide them onto the soup in regular bowls.
Nutrition
Serving: 1servingCalories: 420kcalCarbohydrates: 40gProtein: 19gFat: 18gSaturated Fat: 11gPolyunsaturated Fat: 1gMonounsaturated Fat: 5gTrans Fat: 0.3gCholesterol: 51mgSodium: 1000mgPotassium: 1060mgFiber: 4gSugar: 13gVitamin A: 550IUVitamin C: 12mgCalcium: 314mgIron: 3mg
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