A golden, crispy grilled cheese sandwich filled with melted cheese and flavorful pesto for a rich and satisfying twist on a classic.
4 slices sourdough bread
2 tablespoons pesto
4 slices mozzarella cheese
2 slices provolone cheese
2 tablespoons butter or olive oil
2 tablespoons grated Parmesan cheese
1 small tomato, sliced (optional)
Use a mix of cheeses for deeper flavor. Keep heat moderate to avoid burning before the cheese melts.