Scrub the potatoes very well. Make sure that all the sand is gone, don’t peel them. Then transfer them to a large pan.

Add the coarse salt.

Then pour in the water.

Place the pan over high heat until the water comes to a rolling boil. Then turn the heat lower to medium. Cover the pan and boil the potatoes for 15 minutes or until tender. Then drain the potatoes and immediately transfer them back to the same pan.

Place the pan back over medium heat and let the potatoes dry out for 5 minutes or until they have turned all white. That’s the salt layer forming on the potato skin. Then transfer the papas arrugadas to a dish and serve with mojo.