For the choux pastry, first put water in a pot and boil with butter. Add salt. Stir over high heat with a wooden spoon until the butter has melted.
Remove the pot from the heat and add the flour to the hot liquid all at once, stirring vigorously until the dough forms a lump.
Return the saucepan to the stove and heat the dough vigorously for a short time, stirring constantly, until it separates from the side of the saucepan and no longer sticks to the wooden spoon. Allow the batter to cool.
Then stir in the eggs a little at a time. Pour the choux pastry into a piping bag and pipe onto the baking tray, pressing evenly. Bake in a preheated oven (200 °C) until hot.
After about 10-15 minutes, reduce the heat to 175 °C and bake until they are hollow inside, depending on their size. Remove and allow to cool.