Category: not set
Cuisine: not set
12 (3/4-inch-thick) French baguette slices
1/4 cup unsalted butter
3 pounds sweet onions sliced
3 cloves garlic minced
1/3 cup dry white wine
6 cups beef stock
4 sprigs fresh thyme
2 teaspoons balsamic vinegar
Kosher salt and freshly ground black pepper to taste
1 1/2 cups shredded Gruyère cheese
1/2 cup freshly grated Parmesan
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