Sushi Kushi Toyo in Lake Forest makes it as an appetizer; I'm not sure if it's on the menu, but they've had it every time I've been there. I'd call first to see if they have it that day. There's a sister restaurant in Highland Park (Sushi Kushi Too), but I don't know if they serve tako wasabi.
I couldn't agree with you more - it's the greatest dish I've ever had at a Japanese restaurant (and I AM Japanese). In fact, whenever I go there, I order two of them for myself!
The only downside is that it's a loooooong drive from where I live to Lake Forest. It is worth it, though! It's been a while since I had it. Thanks, Lynda - now I have the craving, too!
Sushi Kushi Toyo
825 S. Waukegan Rd.
Lake Forest, IL 60045
(847) 234-9950