Stuffed Shells recipes

Name: Stuffed Shells recipes
Ingredients: zest of one lemon; 1/3 cup / 80 ml extra virgin olive oil, plus more for the pan; 1 1/2 teaspoons crushed red pepper flakes; scant 3/4 teaspoon fine grain sea salt; 4 medium cloves of garlic, finely chopped; 1 28-ounce can crushed red tomatoes; 1 14-ounce can crushed red tomatoes; 1 15-ounce container ricotta cheese; 1 egg, beaten; 1/4 teaspoon fine grain sea salt; 1 cup / ~5 oz grated mozzarella; 1 bunch of chives, minced; 25-30 jumbo dried pasta shells