1Créé avec l’IA
Peel and thinly slice the yellow onions.
In a large pot, heat the olive oil and unsalted butter over medium heat until the butter is melted.
Add the sliced onions and 1 teaspoon of salt. Cook, stirring frequently, for 30-40 minutes until the onions are deeply caramelized and golden brown.
Add the black pepper and stir to combine.
Pour in the low-sodium vegetable broth and bring the soup to a simmer. Reduce the heat and let it simmer gently for 20 minutes.
While the soup simmers, preheat your oven broiler. Place the whole wheat baguette slices on a baking sheet and toast under the broiler for 1-2 minutes per side until golden.
Ladle the hot soup into oven-safe bowls. Place a toasted baguette slice on top of each bowl and sprinkle generously with grated Gruyère cheese.
Place the bowls under the broiler for 2-3 minutes, or until the cheese is melted and bubbly.
Carefully remove from the oven and serve the soup hot.