1 kg potatoes
400 ml frying oil
Heat the frying oil in a casserole.
Dice the potatoes. Deep fry the potatoes for 15 minutes. Drain them on a cloth or on a sieve.
In a pan fry the sliced onion with 2 tbs of oil until translucent.
In a container beat gently the eggs with a pinch of salt
Add the onions and the potatoes and stir.
In a pan (max 22 cm diameter) heat 2 tbs of oil and pour the egg mixture.
Cook at medium-low heat for circa 12/13 minutes.
Turn the tortilla helping yourself with a lid, just turn the pan upside-down quickly and the gently lower the tortilla on the lid, into the pan again. Cook other 7 minutes. Serve.