High heat creates steam in the choux paste, which puffs the dough up & creates large holes in the cavity of the dough. It is called physical leavening, one of the several types of leavening in baking, including chemical & biological leavening. It ... read more
The ingredients for choux pastry are butter, water, flour and eggs. Like Yorkshire Pudding or David Eyre's pancake, instead of a raising agent, it employs high moisture content to create steam during cooking to puff the pastry. read more