I cant tell you how much we enjoyed growing these black spanish radishes! We bought them from the new-old Comstock Ferre, you can see their page here LINK
They were hardy, really tolerant of our fantastically variable weather this year (cold, wet, endless), only a few went to seed.
Here is a youngish one in the soil.
And then we has some really silly fun picking these godzilla radishes. We figure none of these photos of kids-with-gigantic-veggies will ever make the cut to be in a garden seed catalog!