Mouthing Off
Shut-and-open case: Retirement lasted “about 62 1/2 days,” says Gordon Hummel. Late last year he and wife Jean closed Hummel’s Delicatessen and Sidewalk Cafe, at 2360 East Third Avenue, where for thirty years the duo had purveyed top-notch sandwiches and the best potato salad in town. But they didn’t stay…