Spinach-Stuffed Shells
["1 small onion, diced", "2 (14 1/2 oz.) cans whole tomatoes (undrained)", "1 (6 oz.) can tomato paste", "1 (8 oz.) can tomato sauce", "2 tsp. brown sugar", "1/2 tsp. salt", "1/4 tsp. pepper", "1 tsp. dried whole oregano", "24 jumbo shells", "2 (10 oz.) pkg. frozen chopped spinach, thawed and drained", "1 (16 oz.) cottage cheese", "1 c. Mozzarella", "1/4 tsp. pepper"]
["Place a large saucepan over medium heat.", "Spray with cooking spray and saute onion until tender.", "Add tomatoes and next 6 ingredients and stir well.", "Bring to boil; cover and simmer for 20 minutes, stirring occasionally.", "Cook the shells and drain."]
["onion", "tomatoes", "tomato paste", "tomato sauce", "brown sugar", "salt", "pepper", "oregano", "jumbo shells", "cottage cheese", "Mozzarella", "pepper"]