Japanese Cook Books
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I can't give you an exact cook book, but this link has lots of Japanese sauces: https://www.youtube.com/user/ochikeron
Check it out!
A classic is Japanese Cooking: A Simple Art by Shizuo Tsuji.
There is a 25th anniversary edition available new and an older edition available used on Amazon.com. There are two separate pages for the older and newer editions.
it is a pretty thorough look at traditional Japanese cooking and there is probably as much explanatory text as recipes.
There are several classic sauces in the index, which you can look at online on the Amazon.com pages for the books.
I also recommend Tsuji. Very thorough and informative.
Two more from my library:
Washoku by Elizabeth Andoh. Less thorough on the techniques than Tsuji, but good recipes. I based my last fish entry in the challenge thread on that one. Pretty much focussed on traditional home cooking.
Kaiseki by Yoshihiro Murata, Stunningly beautiful array of kaiseki dishes. Way beyond my level though - as to be expected when Ferran Adrià writes the introduction. The recipes are very short and expect you to have a firm grounding in Japanese techniques. A very good inspiration when it comes to minimalist yet artistic plating.