Spanish potato omelette

Steps

1. Slice the potatoes and onion thinly and cook them in the olive oil over medium heat for 12 minutes until soft.
2. Mix the cooked potatoes and onion into the beaten eggs with salt.
3. Pour everything back into the pan and cook on low heat for 6 minutes until set underneath.
4. Flip with a plate, cook 3 more minutes and cut into wedges.