Umeboshi Soba from Shimbashi
Shimbashi Soba had this plum-flavored version on its menu today. But aside from the mildly red tint, I really couldn't taste the difference. Perhaps the more noticeable change was the new staff, which still seemed to be trying to figure things out: the senior manager working today didn't even know how to take an order and had to get one of his staff to come over instead. They got the order wrong a few times, but they were eventually a bit more attentive with the refills at least.