I’ve heard of it, and I just chopped up a watermelon, so I’ve got the rind. Alas, the recipes online are contradictory, if not actually argumentative with each other. However, I have a bunch of readers who cook, so feel free to suggest recipes for pickled watermelon rind. I’m not afraid of a little work, but I don’t want to spend eight hours fiddling with all the bits, either.