PIZZA ROLLS WITH RICOTTA AND LEEKS - Lidia

Ingredients

• 3 tablespoons extra-virgin olive oil
• 2 medium onions, sliced ¼ inch thick
• 1 bunch leeks (about 24 ounces), white and light green parts, sliced into ½-inch-thick half-moons
• 1 teaspoon kosher salt
• ¼ teaspoon crushed red pepper flakes
• 1½ cups fresh ricotta
• ½ cup grated Grana Padano
• 1 large egg, beaten
• ¼ cup chopped fresh Italian parsley