Successful gnocchi-making requires some attention to detail. And successful gnocchi-maker Christian Hermsdorf, chef de cuisine at Bar Bambino, wants to share some of the details. First, the don’ts: Don’t peel the potatoes, don’t use too much flour, and don’t overcook. And the all-important dos: Peel your potatoes when warm, use a ricer for maximum fluffiness, mix the dough only until it binds, be gentle with the gnocchi, and serve with a simple topping like brown butter and sage.