The ‘wasabi’ you get at most sushi joints is actually just a coloured horseradish paste. Real wasabi is a different plant (but it’s still a type of radish) and far more expensive. It’s also grated fresh on your dish as the flavour dissipates very fast.
Do you mean white radishes or maybe horse radish?
I’m not sure, I’ll take a picture next time.
Horse radish is a spicy mush, tastes a bit like wasabi, but is white or slightly purple if beets were used to colour it.
White radish tastes the same as the pink one, but is large, white and long.
The ‘wasabi’ you get at most sushi joints is actually just a coloured horseradish paste. Real wasabi is a different plant (but it’s still a type of radish) and far more expensive. It’s also grated fresh on your dish as the flavour dissipates very fast.