This onion chopper seems clever, with these intersecting cutting blades forming a grid mounted by a set of plastic hinges to a cutting board. Just swing the knife grid down and – voila! — chopped onions. Too bad the designers didn’t account for the fact that an onion is not isotropic. Depending on the orientation of the onion, some parts don’t get a clean cut. Or no cut at all, as was the case here when the plastic hinge broke under the force applied while attempting to cut axially into the leathery end slice of an onion.