Onion Soup au Gratin — Cozy Comfort Food Recipe

Onion Soup au Gratin

A cozy, comforting classic to warm you up

Onion Soup au Gratin is a timeless French classic known for its deep, savory flavor and irresistible cheesy topping. Made with slowly caramelized onions, rich beef broth, and finished with toasted bread and melted Gruyere cheese, this soup delivers comfort in every spoonful.

Ingredients

• 4 large onions, thinly sliced
• 4 tablespoons unsalted butter
• 2 tablespoons olive oil
• 1 teaspoon sugar
• 1/4 cup all-purpose flour
• 8 cups beef broth
• 1/4 cup dry white wine (optional)
• 1 bay leaf
• Salt and black pepper to taste
• 4 slices French baguette or crusty bread
• 1 cup grated Gruyere or Swiss cheese
• 1/4 cup grated Parmesan cheese
• Fresh thyme or parsley for garnish (optional)

Instructions

1. Caramelize the onions: In a large heavy pot, melt the butter with olive oil over medium heat. Add the sliced onions and cook slowly, stirring occasionally, for 30 to 40 minutes until deeply golden and sweet.
2. Build the flavor: Sprinkle the sugar over the onions and stir for about 1 minute. Add the flour and cook for 2 to 3 minutes, stirring constantly.
3. Deglaze the pot: Pour in the white wine if using. Scrape the bottom to release the caramelized bits and let simmer until reduced by half, about 2 to 3 minutes.
4. Simmer the soup: Add the beef broth and bay leaf. Season with salt and pepper. Bring to a gentle simmer and cook 15 to 20 minutes. Remove and discard the bay leaf.
5. Toast the bread: Preheat your broiler. Toast the bread slices until lightly golden on both sides.
6. Assemble: Preheat oven to 400F (200C). Ladle hot soup into oven-safe bowls, top each with toasted bread, then sprinkle generously with Gruyere and Parmesan.
7. Broil until golden: Broil for 2 to 4 minutes until the cheese is melted and bubbling. Garnish with fresh thyme or parsley.

Helpful Tips

❤️ Made with love in the kitchen • Cozy comfort food