This is the photo taken at a Sushi bar I visited for lunch. Doesn't it look like Matcha ice cream? Actually this is Wasabi for Sushi, lol!
Wasabi is known worldwidely as Japanese horseradish, although horseradish is a different plant. However this is the best explanation to get the image of what Wasabi tastes like.
Once you lick Wasabi paste, you get knocked by the strong and cool flavor through your nose. If you have a full spoon of it, that will instantly cause you headache, and long-lasting sore in your noseholes. This is the different point from the chilli attack and mastard attack. Tongue is less important here to discribe how Wasabi works.
There are countless types of spices in the world, but Wasabi is quite unique because of its extremely cool pungency. Wasabi is indispensable in Japanese dining just as Korean food can't be completed without chilli. Most of the Japanese family have a ready-to-use Wasabi paste in tube. Not only Sushi but also other casual food (such as Kamaboko, a processed seafood product ) go very well with Wasabi.
To get the best of Wasabi, keeping moderate is the key. For beginners, please enjoy it little by little. Again, please do not go pretending to be brave!