This casserole is simple and delicious, and makes a perfect snack during a picnic (bento anyone?)—you should use it as a basic idea for a casserole, since the pasta sauce is the stable and the most important piece of the meal. It's also a very tweak-able recipe! :-)
Tuna paste is ridiculously easy to prepare and makes a great no cooking bento, cutting the preparation time to less than 20 minutes, including rice cooking time! Now, that's what I would call cooking on the go! You can also use the tuna paste for a great tasting onigiri or sushi.
Tomatoes are very healthy thanks to the lycopene, but they also taste amazing when you cook them in a cream soup with a pinch of red pepper and garlic. And herbs, croutons, bread rolls or literally anything you would ever want to put in a cream soup, it's so versatile. And because it's summer time now, you can even let it chill and serve it cold. How cool is that?