How To: Make shepherd's pie moussaka

We make classic Greek "Moussaka" layers of lamb and eggplant, exotically spiced and topped with a rich, almost custard-like sauce. Chef John also loves a good Shepherd's Pie, what's not to like about a pie made out of ground meat and mashed potatoes? So, he thought he would try a Shepherd's Pie using the flavor components of the Greek "Moussaka."