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This is a thick, crusty slice of bread, typically a baguette or similar rustic loaf, that serves as the essential base and topping for classic French onion soup. It is toasted or broiled until golden, often rubbed with garlic, and placed atop the soup to soak up the rich broth while supporting a generous layer of melted Gruyère cheese. The bread originates from France, where it is a fundamental component of the iconic dish 'Soupe à l'Oignon Gratinée'.
The bread itself is primarily a source of carbohydrates, providing energy, with a modest amount of protein and very little fat. A single, thick slice (about 1-1.5 ounces or 30-45 grams) typically contains around 80-120 calories. Its key nutritional role in the soup is to add texture and substance, acting as a vehicle for the cheese and broth.
Culturally, this bread component is so integral that the French term 'gratinée' in the soup's name directly refers to the browned, cheesy crust that forms on top of the bread under a broiler. Nutritionally, it transforms a simple soup into a more complete and satisfying meal by adding significant carbohydrates and, when combined with cheese, a more balanced profile of macronutrients.