Mushroom Gruyere Grilled Cheese

Name: Mushroom Gruyere Grilled Cheese
Ingredients: 1/2 cup robiola fresca cheese, at room temperature (substitute cream cheese if unavailable); 1/2 tablespoon lemon zest; 1 teaspoon chopped fresh rosemary; 1/2 teaspoon white truffle oil; Salt and freshly ground black pepper; 6 tablespoons extra-virgin olive oil; 2 pounds mixed wild and cultivated mushrooms, trimmed and thickly sliced; Kosher salt and freshly ground black pepper; 2 shallots, finely chopped; 2 cloves garlic, finely chopped; 2 tablespoons unsalted butter; 2 tablespoons chopped fresh rosemary; 2 tablespoons fresh thyme leaves; 4 slices pan de mie or French Pullman bread, cut 3/4-inch thick; 1 stick (8 tablespoons) European-style butter, at room temperature; 4 thin slices Gruyere; 4 thin slices fontina; 4 tablespoons chopped fresh herbs (parsley, tarragon, chives and chervil); Coarse sea salt