SpainI was scared to flip for a long time and used a lid or the oven instead. You get something edible, but not the real thing. The tortilla needs to be flipped — without it you don't get even colour on both sides or the characteristic rounded shape. Now I do it without thinking. The key is one fast confident move, not a slow careful one. Slow is actually how people drop it.
Let the egg and potato mixture rest for 5 to 10 minutes before pouring it into the pan. The starch from the potatoes slightly thickens the eggs and the tortilla holds its shape better.
Spanish Tortilla
By Sergei Martynov
Potatoes and onion slow-cooked in olive oil until soft, then bound with beaten eggs and set into a thick round omelette. Five ingredients. The technique is what matters. In Spain this gets eaten at any hour — breakfast, tapas, a wedge in a bread roll at midnight. It is one of those dishes that tastes better the next day cold, which is not something you can say about many things.
Key Ingredients
What you'll need
Ingredients
- 600 g
See recipes with waxy potatoeswaxy potatoes
i - 1 piece
See recipes with large onionlarge onion
i - 6 piece
- 150 ml
See recipes with olive oilolive oil
i - 1 tsp
How to make it
Instructions
- 1
Peel the potatoes and slice them about 4 to 5 mm thick — thin enough to cook through, thick enough to hold shape. Halve the onion and slice into thin half-moons.
- 2
Pour the olive oil into a 24 cm non-stick skillet over medium-low heat. Add the potatoes and onion, season with salt, and stir to coat. The potatoes should bubble gently in the oil — not fry aggressively. Cook for 20 to 25 minutes, turning occasionally with a spatula, until the potatoes are completely tender and the onion is sweet and soft. You are confiting them, not frying. Drain through a sieve over a bowl and save the oil.
- 3
While the potatoes drain, beat the eggs well in a large bowl with a pinch of salt. Add the potato and onion mixture and stir to combine. Let the mixture rest for 5 to 10 minutes — the potato starch thickens the eggs slightly and the tortilla holds together better.
- 4
Return 2 tablespoons of the reserved oil to the pan over medium-high heat. When hot, pour in the egg and potato mixture, then immediately lower the heat to medium-low. Use a spatula to push the edges in and shape the sides into a rounded edge. Cook for 8 to 10 minutes until the edges are set and the centre still looks slightly wet on top.
- 5
Time to flip. Place a large flat plate firmly over the pan. With one hand pressing the plate down and the other gripping the pan handle, flip them in one quick confident movement over the sink. The tortilla is now on the plate, cooked side up. Slide it back into the pan and cook for another 4 to 6 minutes until the second side is golden.
- 6
Slide onto a board or plate. Let it rest for at least 5 minutes before cutting. Serve warm, at room temperature, or cold — all three are correct.
Frequently Asked Questions
How to flip a Spanish tortilla without dropping it — step by step technique for beginners?
The flip is the only moment where things can go wrong, which is why people are afraid of this recipe. You need a flat plate slightly wider than the pan. Run a spatula around the edges to make sure nothing is stuck. Take the pan off the heat, press the plate firmly against the pan with both hands, clamp it between your palm and the pan rim — and flip in one quick movement over the sink (oil may drip). The tortilla lands on the plate with the raw side down. Slide it back into the pan. It is easier than it looks the first time, and much easier the second.
Spanish tortilla with or without onion — which version is more authentic?
This is a genuine debate in Spain and there is no settled answer. Both versions exist on neighbouring bar counters across the country. With onion the tortilla is sweeter and softer — onion slow-caramelises in the olive oil and gives some of its sweetness to the eggs. Without onion the flavour is more austere, more purely potato, and the texture is firmer. If you dislike onion, leave it out — that is not a wrong tortilla. If you include it, slice it into thin half-moons and cook it together with the potato from the start, not added at the end.
Why is my Spanish tortilla raw inside and burnt outside — how do you get the right texture?
The classic problem of too much heat. Tortilla needs to cook slowly on medium-low, not on high. After you pour the egg and potato mixture into the pan, lower the heat and let the first side cook for 8 to 10 minutes. The eggs should set from the edges inward while the top still looks slightly wet — that is when you flip. The second side cooks faster, 4 to 6 minutes. A classic Spanish tortilla is not completely firm inside. It should tremble slightly when you shake the pan. If you want it fully set, cook 2 to 3 minutes longer after flipping.
How much olive oil does Spanish tortilla need — can you reduce the amount?
A lot — and intentionally. The potatoes are not fried, they are confited: 150 ml of oil for 600 g of potatoes creates the right temperature and texture. Less oil means the potatoes fry instead of gently cooking through, and they never get that soft, almost creamy consistency. The oil is not wasted: after cooking the potatoes, drain it into a bowl and use it to cook the tortilla. After that, strain and refrigerate it — it can be reused 2 to 3 more times for the same purpose. So in practice the oil goes much further than it first appears.
What is the difference between Spanish tortilla and Italian frittata — are they the same dish?
Similar shape, different technique and texture. A frittata starts on the stove and finishes in the oven — it cooks evenly throughout but loses moisture in the process. A Spanish tortilla is cooked entirely on the stovetop and flipped by hand — the flip is not optional. In terms of texture, tortilla is denser and more moist: the potatoes are confited in oil before the eggs go in, which changes everything. A frittata typically has more varied ingredients and less potato. A Spanish tortilla is almost always just potato, egg, and salt. Nothing else is needed.
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