NYT Cooking: This golden and glorious mash-up of potato gratin and Hasselback potatoes, from the acclaimed food science writer J. Kenji López-Alt, has been engineered to give you both creamy potato and singed edge in each bite. The principal innovation here is placing the sliced potatoes in the casserole dish vertically, on their edges, rather than laying them flat as in a standard gratin, in order to get t...
