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.
I got tired of sausages after yesterday's deluxe bento, so today I decided to have some eggs with lunch. I put some sweet mustard over the cooked yolk to have them pack some punch and they were really interesting!
I prepared also hand-made furikake (rice sprinkles) with ingredients I like, which made my rice extra tasty today!