Low-Fat Spinach Lasagna - cooking recipe

Ingredients

1 box lasagna noodles
1 lb. lite Ricotta
1 celery
3 egg whites
2 Tbsp. fat-free Parmesan cheese
10 oz. lite Mozzarella cheese
32 oz. tomato sauce
20 oz. spinach
6 oz. tomato paste
2 Tbsp. sugar
2 tsp. salt
1 tsp. pepper

Preparation

First you need to make the tomato sauce.
Recipe is as follows:
Put one teaspoon of oil with chopped onions in a pot. When onions are golden brown, pour in 32 ounces of tomato sauce and 6 ounces of tomato paste.
Stir together for 10 to 15 minutes. Put one tablespoon of sugar and one teaspoon salt and one teaspoon of pepper.