Common Questions
Is a Spanish tortilla supposed to be runny inside?
It depends on preference and region. Many people aim for a slightly custardy center, not raw. A good cue is this: when you gently shake the pan, the tortilla should look set at the edges and jiggle a little in the center. It will continue to set as it rests. If you want it fully set, cook a few minutes longer on the second side and rest it 10 minutes before slicing.
Do I have to use onion?
No, but I vote yes. Onion makes it sweeter and more complex. If onion is not your thing, skip it and add an extra pinch of salt to help the potatoes pop.
What potatoes work best?
Use a waxy to all-purpose potato like Yukon Gold or red potatoes. They hold together while still turning creamy. Russets work, but they can break down faster.
How do I flip it without ruining it?
Use a large flat plate (or a flat lid) bigger than your pan. Take the pan off the heat, then place the plate on top and hold it tightly against the skillet. Use oven mitts and keep your hands away from the rim, because a little hot oil can sneak out. Slide the tortilla onto the plate, invert the pan over it, then flip so the tortilla lands back in the pan. Do it with conviction, like you meant to do it that way all along.
Can I add chorizo, peppers, or cheese?
You can, and it will be delicious, but the classic is just potatoes, onion, eggs, salt, and olive oil. If adding extras, keep them cooked and not watery, and do not overload or the tortilla will not set neatly.