Tasty French onion soup

Ingredients

For the Soup

• Onions: 4-5 large yellow onions, peeled and thinly sliced (about 6 cups total).
• Butter: 4 tablespoons (60g).
• Olive Oil: 1 tablespoon.
• Flour: 2 tablespoons (all-purpose).
• Beef Broth: 6 cups (preferably low-sodium, high-quality).
• Dry White Wine or Sherry: 1/2 cup (optional, but highly recommended for depth).
• Bay Leaf: 1 piece.
• Thyme: 1 teaspoon dried thyme.
• Salt and Black Pepper: To taste.

For the Gratinée Topping (The Cheesy Top)

• French Baguette: Sliced into 1-inch thick rounds.
• Gruyère Cheese: 1 cup, freshly shredded (This cheese is essential for the classic look and taste; Swiss cheese is a substitute).