Start by adding your sliced potatoes to hot olive oil in a heavy pan. They need to be fully covered in the oil — so you’ll need to use quite a bit! Don’t worry, you can reuse it a few times, so it won’t go to waste. Cook the potatoes over a medium heat, remember that you don’t want french fries!
While the potatoes are cooking, add the sliced onions to a separate pan with a bit of olive oil. Sauté these over a medium heat until starting to caramelize (about 15-20 minutes). Add a splash of water if needed from time to time so that they don’t burn.
When the potatoes are fully cooked some may start to break apart. That’s okay, but don’t let them become too broken down.
Keep an eye on the onions so that they don’t burn.
In a large bowl, beat your eggs (which should be at room temperature). Add the cooked onion and mix. Next, you need to drain the potatoes in a large colander (save the excess olive oil for another recipe!).
Once the potatoes have cooled slightly (about five minutes or so) gently stir them into the onion and egg mixture. Be careful that the hot potatoes don’t start to scramble the egg.
Gently pour the tortilla batter into a frying pan over medium-low heat. You don’t want the pan to be too hot. Gently cook the tortilla for about six to eight minutes on the first side. You can run a spatula along the sides to make sure it’s not sticking.
To flip the tortilla grab a large plate — it must be larger than the frying pan! See my note below about the two tortilla trick to make this easier. Put the plate on top of the pan and flip quickly and confidently. It will be runny, but don’t worry — you’ll put everything back into the pan to cook the other side!
Slide the tortilla back into the frying pan and let the other side cook for another six to eight minutes (let it cook longer if you like your tortilla fully cooked through). Then flip back out onto a clean plate. Allow it to cool for at least ten minutes before slicing and enjoying.
Congratulations!!! It looks delicious