It is usually eaten at room temperature, and is standard picnic food. Heat oil in pan, lower heat and sautee potatoes slowly until fairly soft.
Scrape pan so nothing sticks.
Cook slowly until bubbles start to appear on top, or it seems half-cooked. Loosen from pan with spatula if necessary. Place a plate on top, turn tortilla over on to pan, then slide it off into pan to cook on other side. Should be solid when fin- ished. Remove from pan the same way.