Next time anyone's in Tokyo, there's a really little eatery right outside Akihabara station with phenomenally cheap and yummy food. For only 600JPY ($7) I got a "Mini Miso Katsu Don Set" which included:
+ Bowl of soba noodles cooked in miso soup - may be served hot or cold
+ Bowl of rice with a layer of lettuce and pork schnitzel cutlets on top with Tonkatsu sauce