Puff Pastry Cream Slices with Coffee Icing

A member of the Napoleon pastry family, this dessert of crisp puff pastry layers sandwiched with a thick strata of cream-based filling is even richer than its French cousin. (By the way, Napoleons were originally Italian, and called Neapolitans, but the recipe was appropriated by French bakers, who changed the name.) Napoleons are usually prepared with classic pastry cream, but the Austro-Hungarian baker can’t bear not to add whipped cream, a step that lightens the filling. Some bakers fore