Yotsuya: Peruvian
Romina (Yotsuya: Peruvian)
Open 5-11pm. Closed Wednesdays.
Sun: Open Sundays

Brilliant Peruvian food and drinks at relatively inexpensive prices. For variety, they also serve a smattering of dishes from all across Latin America. Try their vanilla flan for dessert, if you still have room. There's also a big lunch menu. (Avoid Sunday nights if you don't like big crowds.)

Shinjuku-ku, Yotsuya 1-7-27, Central Yotsuya Bldg. 2F.
東京都新宿区四谷1-7-27 セントラル四ッ谷ビル2F
Tokyo Beyond Sushi - the guidebook
Tokyo Beyond Sushi
Explore the hidden side of Tokyo dining
Charcoal-grilled pork on skewers, udon noodles in curry-flavored soup, octopus dumplings, deep-fried beef cutlet -- there's a whole world of exciting food in Tokyo that food-loving visitors often miss out on.

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
Sister sites:
Craft Beer Bars Japan
Bars, retailers and festivals
Animal Cafes
Cat, rabbit and bird cafe guide
Where in Tokyo
Fun things to do in the big city
Neighborhood guides and top-five lists from Tokyo experts
Barking Inu
Sushi dictionary and Japan Android apps

Venue listing from Bento.com5 Star Rating: highly recommended