RecipeDelish

Ingredients

• 3 tbsp butter
• 1 tbsp olive oil
• 3 lb yellow onions, thinly sliced
• 1 tsp kosher salt
• ½ tsp black pepper
• 1 tsp sugar
• 2 tbsp all-purpose flour
• 6 cup beef stock
• ½ cup dry white wine
• 1 tbsp fresh thyme leaves
• 4 thick slices of baguette, toasted
• 1½ cup Gruyère cheese, grated

Steps

1. Melt the butter with the olive oil in a large heavy pot over medium heat. Add the onions and salt.
2. Cook, stirring often, 30–40 minutes until the onions are deep golden brown. Add the sugar halfway if they are browning slowly.
3. Sprinkle in the flour and stir 1 minute. Pour in the wine, scraping up the browned bits.
4. Add the beef stock, pepper and thyme. Simmer 20 minutes.
5. Heat the broiler. Ladle the soup into oven-safe bowls, top each with a baguette slice and a generous handful of Gruyère.
6. Broil 2–4 minutes until the cheese is bubbling and spotted brown. Serve immediately, warning everyone the bowls are hot.