Ingredients
- 4 tablespoons unsalted butter
- 2 tablespoons avocado oil or other neutral oil
- 4 large ( 8 to 10 cups) yellow onions , cut into 1/8-inch slices
- 1/2 cup dry white wine , like Sauvignon Blanc
- 2 tablespoons all-purpose flour
- 8 cups mushroom broth
- 3 sprigs fresh thyme
- 2 dried bay leaves
- 1 1/2 teaspoons salt
- 1/2 teaspoon ground black pepper
- 1 tablespoon vegan Worcestershire sauce
- 2 teaspoons balsamic vinegar
- 1 (12-inch) French baguette , cut into 1-inch slices
- 6 slices (about 6 ounces) Swiss cheese
- 1 1/2 cups (about 6 ounces ) shredded gruyere cheese
Personal Notes
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