This pastry is cooked twice to give the lightness found in éclairs and choux buns. Before the final cooking, the paste is fairly wet and needs to be piped.
Sift the flour onto a sheet of greaseproof paper. Place the water, butter, salt and sugar in a pan. Heat until the butter and water come to the boil. Remove from the heat and add the flour all at once.
Mix well using a wooden spoon. Return to the heat and mix until a smooth ball forms and the paste leaves the sides of the pan.