Pâté de Pommes de Terre

Part of the charm of a savory pie or tart is to guess the filling, and Pâté de Pommes de Terre always comes as a surprise to me. It looks so glamorous, it tastes so appetizing, yet can it really be no more than a combination of two starches and some cream? In this version, the richest imaginable, the potatoes are baked inside rounds of puff pastry, then moistened with a generous amount of crème fraîche poured through a hole in the cover. The recipe comes with a tip, passed on by a friend fr