We ate "Tororo Shoyu Udon" (Udon with yam) and "Oroshi Shoyu Udon" (Udon with radish) at Marugameseimen in Shimokitazawa. Marugameseimen (丸亀製麺) is an Udon chain store, where you choose your Udon at the counter and can also buy some Tempura. The two Udon dishes we had are supposed to be eaten with soysauce - The soysauce is provided at the table and you need to put it on the noodles yourself. Unfortunately the soysauce contains Bonito-Stock, so we brought our own sauce. The shop is quite nice, because it is cheap and tastes good and there are Udon which come without soup (soup usually contains Bonito-stock...)!
〒155-0031 Tokyo, Setagaya, Kitazawa, 2 Chome−14−4