To harvest wasabi root, gently dig around the plant to lift ... It is not advised to freeze fresh wasabi rhizomes whole, ...

An curved arrow pointing right. The wasabi served alongside your sushi is most likely horseradish and mustard dyed green — unless you're in Japan. Produced by Emma Fierberg. Original reporting ...

The restaurants were long known for allowing customers to grind their own wasabi roots to produce the spicy paste used as a condiment for soba. But they’ve had to mostly give this up.