Rexburg, Idaho, may be one of the more unexpected places to find a world-class slice of New York-style pizza. The windswept city, home to B.Y.U.-Idaho, is a three-hour drive from the nearest major airport and 2,200 miles from Manhattan. But from its electric oven, Righteous Slice is serving pizza that would not be out of place in Greenwich Village. With a proper char on the bottom, the slices stand up to a fold.