Name: Paul Anguiano Richland, WA (Zone 7a) GW & DG: tropicalaria
It's the stem that is ground finely on sharkskin into a paste just before eating it, usually with sushi. It is in the mustard family, but not much like horseradish as a plant. The leaves, however, are also tasty, as I mentioned above.
Mid-Columbia Gardens Geodesic Greenhouse
Years ago my mother used to say to me, she'd say, "In this world, Elwood, you must be" - she always called me Elwood - "In this world, Elwood, you must be oh so smart or oh so pleasant." Well, for years I was smart. I recommend pleasant. You may quote me.