Ramen is to Tokyo what pizza is to New York City: a hot-button topic that often boils down to water. All three locations of this popular mini chain swear by h20 from the wells of Mt. Afuri in Kanagawa. Pick and pay for a bowl using the picture menu on the vending machine, hand the ticket to the chef, and then join the best-noodle-bar-in-town debate inevitably going on at the bar.