There are several ways of cooking 'papas arrugadas' (wrinkled potatoes). This is one of the easiest ways. Cover the potatoes with peel but properly washed with water and add a quarter of a kilo of salt for each kilo of potatoes.
Put plenty of water into a cauldron and then add: one kilo of beef, another kilo of pork meat or chicken. Three quarters of a kilo of chickpeas (put them to soak the night before) a big piece of sausage (chorizo), one peeled onion, cut in two, two sliced corncobs, salt and a bit of oil.
Take a kilo of sweet potatoes and another of potatoes, peel them and cut them into big pieces. If potatoes are not big enough, don't cut them. Then take a kilo of cherne or salted corvina, previously desalted.