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This is the answer I got from Benihana restaurant chain. Lin

Thank you for your e-mail. We are aware of this intolerance towards gluten
in the diet, 
gluten-protein, wheat, rye, oats and barley. I know that soy sauce contains
wheat. 
Unfortunately, none of our menu items seems to fit your dietary requirement
without 
modifying the cooking procedures and recipes.  All our sauce and salad
dressing 
contain soy sauce.  Onion soup has fried onion which has flour. As a
Japanese restaurant, 
most of our standard menu items has an ingredient of soy sauce. We are very
sorry that 
we couldn't meet your important diet requirement. Please do not hesitate to
contact me if 
I can be of further assistance.

Sincerely,

Steve Takenaka
TLC of Customer Relations Manager
1-800-327-3369 Ext. 2805 

* Visit the Celiac Web Page at www.enabling.org/ia/celiac/index.html *