Ingredients
- 2 tablespoons extra-virgin olive oil
- 2 tablespoons unsalted butter
- 3 medium yellow onions, thinly sliced
- 4 sprigs fresh thyme
- 1 bay leaf
- 2 cloves garlic, peeled and crushed
- Kosher salt and freshly cracked black pepper
- 1/2 cup sweet Marsala wine
- 6 cups beef stock
- 1 loaf Italian bread, cut into thick slices
- 1 cup sliced whole milk mozzarella cheese
- 1 cup shredded Gruyere
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