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! :-)
When you make your own pasta, you will always end up with some scraps, even more if you make ravioli. You can easily recycle this leftover pasta to make maltagliati, meaning "poorly cut" in Italian, which was traditionally meant as food for the poor. We are way past that, and today you can enjoy rich texture and amazing flavor of your pasta without the social stigma ;-)
The bare tuna-paste bento was a great success, but with the arrival of my new bento container, I was left with some extra unused space. I decided to fill the space with easy to make and very tasty iri tamago, which is basically a Japanese kind of scrambled eggs! You can definitely use iri tamago in onigiri, or as a small side dish.