Orzo-Stuffed Tomatoes
["1 c. orzo (rice-shaped pasta)", "6 large tomatoes (about 8 oz. each)", "1 (15 1/2 oz.) jar spaghetti sauce", "2 Tbsp. oil", "1 small onion, finely chopped", "1 (10 oz.) pkg. frozen, chopped spinach, thawed and squeezed dry", "1 (8 oz.) pkg. shredded Cheddar or Mozzarella cheese", "1/4 tsp. salt", "1/4 tsp. pepper"]
["About 1 1/2 hours before serving:", "Prepare orzo as directed, but do not salt water.", "Meanwhile, cut a thin slice from stem end of each tomato; scoop out pulp and dice.", "Place pulp in a 12 x 8-inch glass or ceramic baking dish; stir in sauce."]
["orzo", "tomatoes", "spaghetti sauce", "oil", "onion", "Mozzarella cheese", "salt", "pepper"]