Just Green Horseradish
Real wasabi is a waxy root that you grind down and serve fresh as a paste to add a sweet and pungent flavor to delicate foods like sushi and tataki. Supermarket wasabi (and probably most of the wasabi you've had throughout your life) is just dyed horseradish. That's why people can't stand the green stuff, horseradish is extremely pungent in comparison to the real deal wasabi.
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