I have a Mexican cookbook (NOT texmex) I got in Mexico City. A lot of their potato dishes are made with diced potatoes, fried and then eaten with a variety of sauces made with chiles, chorizo, tomato, peppers and mexican cheese, so the recipes from Marval are the right sort of thing. Another thing they make is potato cakes from boiled potatoes mashed with the hand so they are coarse, made into cakes and fried and then served with a mexican sauce poured over it, with similar ingredients to above.