Lunch on workday, especially Monday, Kotetsu would still be on top of my list of places to go! Plus, if you are arriving around 1:15pm, there is essentially no line => Major plus.
Shiro light and shiro do not differ that much in taste, but a reduce in calories! Soup with green union is still to die for!
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Kotetsuhttp://www.yelp.com/biz/kotetsu-santa-clara