... That the wasabi you eat in sushi restaurants isn't the real thing.
Authentic traditional wasabi is freshly grated and eaten on the spot as it looses its heat within a few minutes after being served. The real thing tastes more herbal and also does not have a searing, bitter taste.
So what are you actually consuming?
The wasabi consists of mustard, horseradish, starch and green food colouring!
Don't believe me?
Click on THE REAL WASABI and THE REAL THING.
Oh by the way, wasabi is a plant!