I ran across this recipe the other day and instantly went out looking for Wasabi Powder. I've never looked for this before, I'm not even sure I knew it existed, but I can tell you I'll be looking for lots of ways to use it now.
By the way, I found it at Wal-Mart, in the Asian food aisle.
Go check out the recipe, and the whole Tasty Kitchen website. We loved these green beans.