Beef And Spinach Lasagna

Ingredients

• 1 lb. ground beef
• 1/4 tsp. salt
• 1 (26 to 30 oz.) jar spaghetti sauce
• 1 (14 1/2 oz.) can Italian-style diced tomatoes, undrained
• 1/4 tsp. ground red pepper
• 1 (15 oz.) carton part-skim Ricotta cheese
• 1 (10 oz.) pkg. frozen, chopped spinach, defrosted and drained
• 1/4 c. grated Parmesan cheese
• 1 egg, beaten
• 10 uncooked lasagna noodles
• 1 1/2 c. shredded part-skim Mozzarella cheese