I had a chance to revisit Maisen (see tonkatsu post) while my folks were in town. I can confirm that there is indeed karashi mustard provided in a jar and that the regular tonkatsu are just as tasty and significantly cheaper than the 黒豚 version (nearly half the price at around 1700 yen).

Also, there is a Maisen in both the Daimaru department store near the Yaesu North Exit of Tokyo Station and in GranSta, both of which I rave about in this post. Actually, at the GranSta store they sell a circular tonkatsu sandwich available only at the GranSta shop. Worth remembering if you’re hungry and happen to be catching a train at Tokyo Station.