Prepare all the ingredients. Blanch the potatoes in salted water (starting with cold water). Drain them well... ...and toss them while warm into a sauté pan containing your boiling oil. Brown evenly by stirring from time to time. When finished, remove the excess oil then add a nice knob of butter. Add fine salt. Serve very hot.
Par-boiling raw ingredients for a few minutes in a large amount of salted water: the ingredients are placed in cold water and brought to the boil.