Tomato Lasagna Roll-Ups - cooking recipe

Ingredients

8 pieces lasagna, cooked (8 oz.)
2 Tbsp. olive oil
1/4 c. finely chopped onion
1 3/4 c. stewed tomatoes (14 1/2 oz. can)
2/3 c. tomato paste (6 oz. can)
1/4 tsp. ground black pepper
1 3/4 c. Ricotta cheese (15 oz. container)
1 1/4 c. frozen, chopped spinach, thawed and well drained (10 oz. pkg.)
1 c. shredded Mozzarella cheese
1 egg, slightly beaten
2 Tbsp. grated Parmesan cheese
1/2 tsp. salt

Preparation

Cook pasta according to package directions; drain.
Lay flat on foil to cool.
Heat oven to 350\u00b0.
In skillet, heat oil.
Add onion; cook, stirring frequently until tender.
Add tomatoes and tomato paste.
Heat to boiling; reduce heat.
Simmer 5 minutes, stirring to break up tomatoes; set aside.