Green Bean Gratinate with Cherry Tomatoes, Mozzarella, and Basil - Lidia

Ingredients

• 1 1/2 pounds fresh green beans
• 1/2 teaspoon kosher salt
• 3/4 pound cherry tomatoes (about 3 cups), preferably small grape tomatoes
• 1/2 pound fresh mozzarella
• 4 to 6 fresh basil leaves
• 1 cup grated Grana Padano
• 1/2 cup dry bread crumbs
• 3 tablespoons butter
• 3 tablespoons extra-virgin olive oil