Bring oil to a boil. Place sliced potatoes in a frying basket and plunge them into the hot oil. They should begin to swell and colour in a few minutes. Remove basket from oil and allow potatoes to cool.
Bring oil to a boil again, this time a little hotter than before, and plunge the basket of sliced potatoes into it again. Continue to cook until potatoes are puffed and golden. Drain, se