1. Mix the water, milk, butter, salt and sugar in a saucepan over medium heat. Bring to the boil, then add all the flour and stir until it no longer sticks to the side of the pan.
2. In a separate bowl, whisk the eggs. Remove the saucepan from the heat and pour in the whisked eggs to the dough.
3. Pre heat your oven at 250ºC. Shape your choux with a pastry bag. Place the pastry in the oven and turn oven down to 180ºC. Bake for 20 minutes, without opening the door so the choux can rise.
4. When the pastry has cooled, cut down the centre and fill with whipped cream or vanilla ice cream and top with melted chocolate.