First off, the mapped location for this little restaurant is incorrect. It is NOT in Tokyo Station, as I discovered two years ago when I first went hunting for this hole-in-the-wall. Luckily it's pretty well-known and a guy on the street knew where to direct me. If you are at Tokyo Station, exit at Marunouchi-South from the underground exit. As you walk up the steps you'll be looking at the facade of Tokyo Station; turn right at the top of the stairs and walk alongside the station. Follow the main road as it bends to the left a bit. Once you've passed the end of the station, you'll walk by a row of small shops/restaurants. The TOKIA building, which houses the restaurant, is across the street. The restaurant is down one level, about halfway down the hall on the left. There are lots of little restaurants down there - none with names written in English. Kiji has one of those split pieces of fabric Japanese places sometimes hang in front of the doorway. It's blue with Japanese characters on it.
Once I found the place, I've come back every time I'm in Tokyo.
The restaurant specializes in Okonmiyaki, a dish local to Osaka, which are fairly large vegetable-based pancakes topped with various meats, mushrooms, sprouts and a special Okonomiyaki sauce. There is a corn and potato version for veggies which is pretty good too. The pork and mushroom is my personal favorite. The pork is essentially thick pieces of bacon which grill down to crispy strips that become embedded in the pancake. Topped with some delicious variety of Japanese mushrooms and a scattering of chopped leeks, (oh, and a raw egg...gotta keep it weird; this is Japan after all) it's a hearty and satisfying meal. You can also have beef tendon (which sounds revolting but actually looks outstanding) or various types of seafood as your protein.
The pancakes are grilled on a large griddle which runs the length of the bar at the back of the restaurant. If you're eating at the bar, they just push your pancake in front of you and you can chop off pieces to eat while the rest of the cake sizzles away. Each table in the restaurant has its own cook-top so if you're not at the bar the food is dropped off at your table and allowed to finish cooking there. It's a fairly unique restaurant experience, and kind of fun.
The restaurant is small and quite popular so be prepared to wait in line at peak lunch and dinner times. One of the cooks will come out and take your order while you wait so your food will be nearly ready by the time you are seated. But even if you can't make it at an off hour don't let the lines scare you away from experiencing this delicious and uniquely Japanese treat.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.