Peel the potato. Use the peeler to shave off fine shaves of the potato.
In a bowl mix the potato shaves with pepper and cayenne pepper.
Heat the oil and fry the shaves. They should get dark but not burned. Take them out and pad the excess oil off with kitchen paper towels. Salt them. Once they have cooled down they will be crisp.
Let it boil for 30 min, check if the vegetables are cooked and pure it. Add water if the soup is too thick for you. Add the orizo pasta and let them cook off the heat ( the soup should be hot enough to cook them), and you can stir in more coriander.