spanish omelette

Ingredients: 4 eggs, sel, 2 or 3 potatoes, 1 onion and olive oil.
 Firts cut cut the potatoes and onion.
Then cook the potatoes and in a hotpan with olive oil.
 Next add sel.
 After that beat the egg an mix with potatoes and onion.
 Finally, cook all these in the pan. The resault is like a cake.