Wasabi Powder is the Japanese version of Horseradish and comes from the root of an Asian plant. This powder is used to make a light green colored condiment with a pungent, sharp, fiery flavor. The flavor of Wasabi is very intense then slowly dulls.ÊSuggested Use: Serve with sushi and sashimi. Ingredients: Horseradish, Ascorbic Acid, Citric Acid, Artificial Colors (FD&C yellow #5, FD&C blue #1), Corn Starch. Basic Prep: Mix the powder with an equal quantity of tepid water and leave for 10 minutes to develop its flavor. Wasabi accompanies most raw fish dishes.