Coarsely grate the potatoes by hand or cut into thin slices. Mix with salt and bacon.
Melt butter in a heavy based frying pan Add the grated potatoes and stir several times so that the fat and the potatoes mix well.
Fry well over a medium heat turning repeatedly. After about 6 minute push the potatoes together, increase the heat and cook for an additional 4 minutes so that the bottom of the potatoes forms a crispy crust.