I love this because it's a healthy, delicious, easy to prepare pasta bake. I've used small home-grown tomatoes and also Heinz Tomato Soup! I have made it using frozen spinach but fresh can be used as well. My family love it!
Parmesan cheese is not truly vegetarian, as it contains animal rennet. To make this dish 100% vegetarian, omit the cheese or find a suitable vegetarian substitute made without animal rennet. In supermarkets look for the 'parmesan style hard cheeses' which are suitable for vegetarians.