cook tortelline according to package

in large sauce pan saute onions and garlic in butter until tender

combine cornstarch and milk until smooth, gradually stir into pan

bring to a boil, cook for 2 min or until slightly thickened

stir in mozzarella cheese until melted, stir in in ricotta cheese, salmon, dill, lemon peel, lemon juice and sauce

drain tortellini, add to ricotta sauce, cook and stir until heated