Peel and cook the potatoes in salted boiling water, then drain and mash them to get a smooth mixture.
In a saucepan, boil together the butter, sugar, salt and water together. Remove the pan from the heat and add the flour and mix well. Put the saucepan back on the gentle heat.
Beat the eggs together and gradually add them to the dough mixture, mixing until the dough is smooth and thick.
Add the potato mash to the dough and place the whole mix in a piping bag. Pipe the mix in spirals straight into hot oil and cook until golden. Drain the fries on a paper towel to remove excess oil, and enjoy with sauce.