Heat water, milk and butter in a saucepan.
When this reaches a rolling boil, add the flour, salt and sugar and stir continuously.
Beat until a smooth ball forms and it's coming away from the sides of the pan.
Transfer to a mixing bowl and leave cool for 20-30 mins.
Preheat your oven to 220°C/200°C fan.
Beat your eggs in a separate bowl. GRADUALLY add the eggs to your dough. Combine well after each addition. You want the dough to look smooth and shiny and be a dropping consistency. This means that if you fill the wooden spoon with your pastry and lift it up over the bowl, the pastry should fall back from the spoon into the bowl with a gentle plop. You might not need all the egg.
On a prepared baking sheet, pipe 3cm rounds of our choux pastry well spaced out or spoon with a teaspoon. Any pointy bits, just tap down with a wet finger. You can bake in separate batches if necessary. At this point, the rounds can be frozen to be baked later.
Bake in the preheated oven for 20 minutes. Do not open the door during this time.
When removed from the oven, poke a hole in the bottom of each to allow the steam out and leave to cool.