Bring the water, sugar, salt and butter bring to the boil, in a medium saucepan. When the mixture is boiling, add the flour, remove from the heat and mix together to form a thick dough. Allow to cool.

Once cooled, add the eggs slowly to the dough, a little at a time. Mix until all of the egg has been added.

Preheat a saucepan half filled with oil over moderate heat. Fry a small piece of dough in oil to check that the dough is the correct consistency and the oil is the correrct temperature.

Place the dough into a piping bag with a fluted nozzle. Pipe 5-8 cm long pieces of dough into the oil. Fry over medium heat turning the churros in the oil regularly for 8-10 minutes. Dtrain on paper towel and dust with cinnamon sugar.

Serve hot with a dark chocolate sauce or a cup of hot chocolate.