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Spanish Tortilla (Tortilla de Patatas)

Name: Spanish Tortilla (Tortilla de Patatas)
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Yield: 4 servings
Cuisine: Spanish
Ingredients: 4 Potatoes; 1 Onion; 6 Eggs; 250 ml Olive oil; 1 tsp Salt

Spain's national dish: potatoes and onion gently cooked in olive oil, then set with egg into a thick round omelette. The ingredients are simple — the art is a juicy center. Great warm or cold.

Ingredients

4servings

Steps

Peel and thinly slice the potatoes (3–4mm) and slice the onion.
⏲ 5 min
Pour a generous amount of olive oil into a pan over low heat, add the potatoes and onion, and 'confit' them — cook gently 15–20 minutes until tender, without browning (not a hard fry).
⏲ 18 min
Drain the potatoes and onion in a sieve (save the oil) and season with salt.
⏲ 2 min
Beat the eggs in a bowl, fold in the warm potatoes and onion, and let sit about 5 minutes to meld.
⏲ 5 min
Heat 1 tbsp oil in the pan over medium, pour in the mixture, and cook 2–3 minutes, tucking in the edges.
⏲ 3 min
Cover with a plate (or lid), flip the pan to turn it out, and cook the other side 2–3 minutes. Slide out while the center is still slightly juicy (jugosa); cool, then slice.
⏲ 4 min

Variations

Without onion (sin cebolla): Many purists skip the onion — a matter of taste.
Chorizo or peppers: Add chorizo or roasted peppers for richness.
Runny vs set: Leave the center juicy (jugosa) or cook it fully through.
Pinchos: Cool, cube, and set on bread for a tapas-style bite.

Tips

Confit, don't fry — cook the potatoes gently in oil until tender without color.
Rest the potatoes in the egg for 5 minutes so the flavors meld.
The flip is the key move — cover with a plate and turn it confidently in one go.
Pull it off the heat while the center is slightly juicy; residual heat finishes it.
The leftover olive oil is flavorful — save it for other cooking.

More detail and the reasons why (4)

"Confit, don't fry" is an instruction about the oil's temperature. It is the principle behind carnitas: fat "is not capped at 100°C", so the cook picks where to hold it, and at 85-95°C "this is not frying" — none of the violent steam frying needs, so the surface never dries and never browns. The same pot of the same fat becomes a fryer only when the heat goes up. A tortilla keeps it under that line for the whole twenty minutes, which is why the potato comes out tender and the colour never arrives.
No colour is the point, because the slice has to stay soft all the way to its face. A browned edge is a dried, firmer surface; a confit slice is soft right to the outside, and that is what lets the egg meet it rather than run around it. The five minutes of resting in the beaten egg are for the same reason.
Chipsi mayai is the same three ingredients with the opposite decision about that face. There the potato is fried twice for a crust and the egg is poured over while the chips are still hot, because "chips left to cool have already gone soft, and they turn to mush inside the egg"; the egg "is there to bind, no more". Here there is no crust to protect, so contact time is a feature instead of a cost — and the proportions move with it, since a tortilla is mostly egg by volume and holds its potato loosely by comparison.
The flip is not showmanship, it is the only heat this dish has. Cooking eggs puts white at about 62°C and yolk at about 68°C, and a 3cm egg mass heated from below alone would brown its base long before the middle reached either. So the pan is turned over and the same low heat is put under the other face. Chipsi mayai reaches for a lid and lets steam set its top surface; a tortilla cannot, because that would set the centre too, and the centre is supposed to leave the heat still jugosa and finish on carryover.