Ingredients
- 1 cup white wine
- 1⁄2 cup plus 3 tbsp. sherry
- 10 tbsp. butter
- 1 tsp. sugar
- 3 large yellow onions, thinly sliced
- Kosher salt and black pepper, to taste
- 6 sprigs flat-leaf parsley
- 6 sprigs thyme
- 2 fresh bay leaves
- 2 qt. Beef Stock
- 12 (1/2″-thick) slices baguette
- 2 cloves garlic, smashed
- 6 cups grated gruyère cheese
- 2 cups finely grated Parmigiano-Reggiano
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