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["FILLING: Melt butter over medium heat in a large, heavy dutch oven.", "Add onions& garlic; cook until onions are tender& wilted, stirring occasionally.", "PREPARE ZUCCHINI: Wash well, taste a bit of the skin from each& peel only if it tastes bitter.", "Grate& place in a colander in the sink.", "sprinkle with about 2 tsps of salt& let excess liquid drain for 30 minutes.", "Rinse with cold water to remove most of the salt& then toss on a clean tea towel (or paper towels) to dry before cooking.", "Add drained zucchini to dutch oven& cook until any moisture evaporates.", "PREPARE SPINACH: Wash well& trim off tough stems.", "Place leaves, with water from washing still clinging to them, in a large pot.", "Cook for a few minutes or just until leaves have wilted.", "Let cool, then wring dry in a clean tea towel& chop.", "Add spinach to the dutch oven and combine thoroughly.", "Remove from heat& allow the mixture to cool.", "Drain off excess liquid.", "Beat eggs in a medium sized bowl; add ricotta& beat until smooth.", "Add Parmesan and seasonings; mix well.", "Combine with vegetable mixture in the dutch oven, mix thoroughly; set aside.", "SAUCE: Melt butter in large, heavy pot; cook onions& garlic until tender and wilted.", "Add tomatoes, including their liquid, breaking up the tomatoes with a wooden spoon.", "Cook for 30- 45 minutes or until sauce has thickened.", "Puree and test for seasonings.", "Set aside.", "Pasta: Cook shells in a large pot of salted water, according to package directions until""el dente"".", "Drain well and rinse with cold water to stop cooking and prevent sticking.", "Using a colander, gently shake shells to drain excess water.", "Lightly grease a 13 x 9 inch casserole dish.", "Spoon some of the filling into each shell& arrange, stuffed side up, in the casserole dish.", "Pour sauce over the shells& sprinkle with Parmesan cheese.", "(If you can only find small shells, just layer them on the bottom of the casserole dish, cover with a layer of filling, a layer of sauce and sprinkle with Parmesan).", "Bake at 350u00b0F for 40-50 minutes or until heated through and bubbling."]