Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      small         onion -- chopped
     1/2  cup           tomato paste
   1      cup           tomato sauce
     2/3  cup           water
   1      teaspoon      marjoram
   1      teaspoon      basil
     1/4  teaspoon      salt
     1/8  teaspoon      pepper
   1      cup           fat-free ricotta cheese
   6      ounces        shredded part-skim-milk mozzarella -- divided use
   8      ounces        ziti pasta -- cooked and drained

Preparation:

Lightly coat a medium-size non-stick pan with cooking spray. Sauté‚onion until tender. Add tomato paste, tomato sauce, water, herbs, salt, and pepper. Simmer, covered, 10 minutes. Combine ricotta and half the mozzarella in a large bowl. Add the cooked ziti and half the tomato mixture. Stir gently to mix. Turn into a 1 1/2-quart casserole coated with cooking spray. Pour remaining tomato mixture on top and sprinkle with reserved mozzarella. Bake in a preheat 375øF. oven for 25 to 30 minutes or until the cheese is melted and browned.