Over the last three weeks, Serious Eater Robyn Lee and I have subwayed up and down the boroughs, making many doughnut stops. The doughnut variation and varieties we found were endless and fascinating. From the high-end indulgences where doughnuts ran more than $4, to the low-brow 70 numbers, we ate them all with great gusto. We even took a dip in at Dunkin' Donuts and Krispy Kreme for "quality checks." We ate and we ate. And then ate some more. We anal More →