Radishes this year, apart from a couple of first good ones, have been a complete failure.I planted them in several different places and the only ones that actually grew nice red radishes were in a rubbish sandy soil in a very small container on the terrace. Others, including ones in the shady spot in free soil and in a nice sunny spot in a big container full of rich compost, turned thin and woody, basically like a bit thicker stems and not radishes at all.
So I let them be, since the snails quite enjoy eating their leaves, I saved them as a fresh food source for my pets. They went into flower and then produced juicy-looking seed pods, which, according to Alys Fowler, are edible!
So I tried one and I was pleased to discover that they have a really nice gently radishy taste, but not as spicy as radishes. I actually prefer the pods.
I added them to salads that I made for my lunch and we made one delicious stir-fry with them as well.
A little article about radish seed pods from Mother Earth News here
Garden Betty's blog post about pickling radish seed pods with beautiful photographs here