I love eating sushi, but what exactly is sushi anyway/  Is it just raw fish?
Yes but I believe it have to be very fresh and they use rice and other ingredients too.
Yeah and it is typically prepared with ginger, wasabi, or soy sauce as well.
I love wasabi, any idea how is it made?
Well it is a plant, and what we eat is the stem.  But typically they'll slice it, or make it into a powder first.  Sometimes they'll make it into a paste though.