The BEST French Onion Soup Recipe A Taste of Paris

Ingredients

• 3 tablespoons (45ml) unsalted butter
• 2 tablespoons (30ml) olive oil
• 3 pounds (1.36 kg) yellow onions, thinly sliced
• 1 teaspoon (5ml) granulated sugar
• 1/2 teaspoon (2.5ml) kosher salt, plus more to taste
• 1/4 teaspoon (1.25ml) black pepper, plus more to taste
• 1/4 cup (60ml) dry sherry or dry white wine (optional)
• 8 cups (1.9 liters) beef broth or stock
• 2 sprigs fresh thyme
• 1 bay leaf
• 1 tablespoon (15ml) Worcestershire sauce
• 6 slices baguette, about 1 inch (2.5cm) thick
• 2 tablespoons (30ml) olive oil, for brushing
• 6 ounces (170g) Gruyère cheese, shredded (or a mix of Gruyère and Swiss)