Choux
It is poured into a pan hot or cold water, salt, sugar and butter. hot until the first boil and, when butter is melted, walk away from fire and put all the flour passed by the sieve. Remove with a spatula, put back to fire and stir until the dough no longer adhere to the pan.
It then withdrew from heat and add egg yolk and clear, one at a time while working. The dough should be soft and smooth, but not liquid. If liquid can be added an egg.