Deep dark chocolate truffles with flecks of walnut and hazelnut feel so much like a naughty indulgence that you’ll catch yourself stealing them when nobody’s looking. But why? They are entirely fruit and nuts, without any added sugar or cream. These wholesome concoctions play such a trick on our confection detectors that this recipephany may be more appropriate for April Fool’s Day than Valentine’s Day. The idea for these truffles came from my sister-in-law Sheila. A few years ago she brought us some soft and creamy Medjool dates and a recipe for turning them into no-bake vegan brownies. We mixed up a batch, rolled them into balls and called them “Cocoa Medjools.” I’ve embellished…