How do a Spanish tortilla?

Hi there! The most popular spanish tortilla is the one with potatoes. You have to fry some sliced onions and cut potates (cut as in small cubes) in some olive oil. When they are cooked throw the beated eggs in the same souce pan and after 3 or 4 minutes turn it around (you can use a plate the same size of the pan). Don't forget to put some salt! Enjoy!