When I ordered "matsutake" 松茸 from Oregon Mushroom, I found that they also sell wasabi rhizomes in 2 oz increment (2 oz is about one rhizome). I took advantage of this offer and ordered some wasabi with the fresh matsutake and other fresh mushrooms.
I tried to get good fresh tuna sashimi from Catalina Offshore products coinciding with the arrival of the wasabi rhizome but fresh sashimi blue fin tuna has been out of stock at Catalina for some time, so I resorted to my backup frozen saku (block) of yellowfin tuna.
If you have not tasted freshly ground real wasabi, you are missing a lot. The fresh wasabi does have some heat but it is much fresher and flavorful than the stuff served at sushi bars that cleans out your sinuses. All these "usual" suspects I prepared as driking snacks got upgraded one notch by simply adding fresh wasabi!