Papas Arrugadas or Wrinkled Potatoes is the most traditional dish cooked in the Canary Islands.
You will find this dish in all the restaurants as a side dish, always accompanied with sauce. The sauce is called Mojo and depending on the island it will be different. In Tenerife you will find Mojo Verde (with coriander and garlic) and Mojo Rojo (with peppers).
Here is a video recipe that shows you how to prepare this meal at home.