Tomato Lasagne Roll-Ups
["8 pieces (about 8 oz.) uncooked lasagne noodles", "2 Tbsp. olive oil", "1/2 c. finely chopped onions", "1 3/4 c. stewed tomatoes", "3/4 c. tomato paste (6 oz.)", "1 3/4 c. Ricotta cheese", "1 1/4 c. frozen chopped spinach, thawed and well drained", "1 c. shredded Mozzarella cheese", "1 egg, slightly beaten", "2 Tbsp. grated Parmesan cheese", "1/2 tsp. salt", "1/4 tsp. pepper"]
["Cook pasta according to package directions; drain. Lay flat on foil to cool.", "Heat oven to 350\u00b0.", "In skillet, heat oil.", "Add onions; cook, stirring frequently, until tender and add tomatoes and tomato paste.", "Heat to boiling; reduce heat.", "Simmer 5 minutes, stirring to break up tomatoes; set aside."]
["noodles", "olive oil", "onions", "tomatoes", "tomato paste", "Ricotta cheese", "spinach", "Mozzarella cheese", "egg", "Parmesan cheese", "salt", "pepper"]