Photo: Emma Wartzman Cutting corn kernels off of the cob is famously annoying. And while I’m generally pretty skeptical of single-use kitchen items, I’ve come around to certain ones that actually make my life easier. In other words: Do I need an apple corer? No, because a knife gets the job done perfectly. But a corn stripper? That’s a different story. The journey to find one I could get behind was sparked several weeks ago after I had to tackle ten cobs for a dinner-party corn salad and