鰻丼.

Unadon's are a quick and simple one dish meal. Pair that with a warm bowl of miso soup and lunch is served. 

All you need to do is to get yourself a pack of unagi (1 pack serves two people), pop that in the oven and that's done. You would also need to get some unagi sauce that you would then drizzle over the unagi and I pour extra onto the rice as well and that's about it.