The Food LabEver wondered how to pan fry a steak with a charred crust and an interior that's perfectly medium rare from edge to edge when you cut into it? How to make homemade mac 'n' cheese that is as satisfyingly gooey and velvety smooth as the blue box stuff, but far tastier? How to roast a succulent, moist turkey (forget about brining!)and use a foolproof method that works every time? As Serious Eats's culinary nerd in residence, J. Kenji Lpez Alt has