We eat watermelon a few times a year, and usually throw the rinds into the compost pile. I figure that’s what most people do. But a while back I ran across the idea of pickling the rinds, and I was immediately hooked on the concept; I love the idea of using a quick, simple pickling process to render something that’s usually inedible into a delicious, tangy, and crunchy treat.
It might sound a little weird at first glance, but watermelon pickles have been around for a while. While in Germany and Eastern Europe they tend to pickle the red flesh of watermelon, there are a few Scandinavian recipes that focus on pickling the rinds. In the US, there are records of people making pickles of watermelon rinds dating back to the Civil War; those original recipes call for soaking the rinds in a salt brine, then boiling with sugar, vinegar, cloves, and cinnamon until clear and soft, which turns it into something resembling a sweet relish. I went with a Scandinavian approach, but left a little of the flesh on the rind in order to add a little natural sweetness to the pickle and to aid in the fermentation process (bacteria likes sugar!).