Crispy Prosciutto, Sage Pesto, and Tomato Grilled Cheese

Name: Crispy Prosciutto, Sage Pesto, and Tomato Grilled Cheese
Prep time: 15 min
Cook time: 10 min
Total time: 25 min
Cuisine: European, American, Italian, Mediterranean
Ingredients: 1 tomato, thinly sliced; kosher salt and black pepper; 3 ounces prosciutto; 4 slices sourdough bread; 1 cup shredded fontina; 1/2 cup shredded mozzarella; 1/4 cup basil pesto; 2 tablespoons chopped fresh sage; 1 cup fresh baby arugula; 4 tablespoons salted butter, at room temperature; 2 tablespoons grated parmesan cheese