I just made my own pickled herring last week - my supermarket has been having smoked herring filets for $5 a lb and I decided they'd probably work just fine to pickle - the texture is unappealing to eat as-is. really easy - soak in milk for a day, then mix up a vinegar-sugar brine with some spices. I think the smoked flavor adds a lot. I've been eating them with cream cheese on bread and bagels, but am going to have to try it as a radish salad. (or maybe mild spring turnips? I've got some of those!)