Spicy Joes Wasabi Powder is imported from Japan and is 100% Wasabi. Alot of the supermarket brought Wasabi isnt wasabi at all but copies. It just does not compare. 
Very popular in Japanese and oriental cuisine, especially with Sushi.
Add cold water to the wasabi powder using a 1:1 ratio. 
Adjust the amount of water to make your preferred thickness.
After mixing thoroughly, it is best used straight away but can be stored in an air tight container.