Pâte à Choux — The Film on the Bottom of the Pot

Pâte à choux (choux pastry) is among the most technically specific preparations in the French pastry canon — a cooked paste, not a raw dough, that achieves its rise entirely through steam rather than chemical or biological leavening. Its origin is often attributed to Pantanelli, a Florentine chef who came to France in the court of Catherine de Medici in 1533, and its modern form is credited to Carême, who refined it into the éclair and profiterole forms known today.

Choux is unique in that it is cooked twice — first on the stovetop, then in the oven. The first cooking (the "panade") is a process of gelatinising the starch in the flour and evaporating water from the mixture of butter, water (or milk), salt, sugar, and flour. This panade must be cooked until a specific event occurs that no recipe adequately communicates: a thin, dry film forms on the bottom of the pot. This film — visible when the paste is stirred away from the bottom — means the starch has fully gelatinised and sufficient water has evaporated to allow the eggs to be incorporated without making the mixture too liquid. If this film does not form, the paste is too wet; the piped choux will spread on the baking sheet rather than rising. Eggs are then beaten in one at a time (or in a slow stream if using a stand mixer) — each addition must be fully incorporated before the next. The correct final consistency: when a spatula is lifted, the paste falls in a slow, thick, continuous "V" shape. Not a lump (too stiff). Not a stream (too liquid). A "V."

Choux is a delivery system. It has no significant flavour of its own beyond a faint egg-and-butter richness. Its value is the hollow — the interior that holds cream, mousse, praline, or ganache. The pastry should be invisible. If the shell is prominent on the palate, it was overbaked, too thick, or the filling was insufficient.