The specialties of the house at Sasamoto are grilled skewers of pork and beef, with an emphasis on organ meats. They're also known for their kushi-nikomi - pork giblets on skewers in a rich miso-based stew. You can order a la carte (there are around fifteen different grilled skewers), or take the easy approach with one of the set menus that feature a variety of grilled items plus one small portion of stew.
Some of the highlights here include both beef and pork skirt steaks, pork tongue grilled in miso, and tender pork liver. Braised cabbage served in a rich, fatty pork broth was also quite nice. Note that the shop doesn't provide chopsticks, so you're expected to eat directly from the skewer. Don't plan on sharing.
The tasteful decor is retro Showa-style, with tile floors, old movie and theater posters on the walls, and jazz on the stereo. Set menus start at around Y2000.
This book will introduce you to more than twenty of Japan's favorite specialty foods that are less well known abroad, along with a guide to the best places in Tokyo to try them and expert tips on what to order. From Bento.com.