Add potatoes to a pan of very salty water. The potatoes should float in the water. If they don’t, add more salt. Bring to a boil; simmer about 25 minutes. Drain off most of the water; reduce heat to allow any liquid to evaporate. shake pan to enable salt to crystallize. Turn off heat, cover potatoes with a tea towel about fiver minutes to enable potatoes to dry and turn “wrinkly”.