Tortilla de Patatas

La tortilla de patatas es el plato más universal de la cocina española: patatas confitadas lentamente en aceite de oliva, mezcladas con huevo (y cebolla en la receta tradicional) y cuajadas en la sartén hasta quedar dorada por fuera y jugosa por dentro.

Preguntas / Questions

¿Lleva cebolla la tortilla de patatas?

La receta tradicional con cebolla es la mayoritaria en España — la dulzura de la cebolla confitada con la patata es la combinación clásica.

¿Cómo se consigue una tortilla jugosa?

Confitando las patatas a fuego suave en abundante aceite y cuajando la tortilla poco: el centro debe quedar apenas cuajado.

Spanish · Moderate · 4

Ask a Spanish kitchen for the national dish and you will get this: potato, egg, olive oil, salt — and an argument. The argument is onion (in Madrid they add it, in much of the south they consider that a confession), and it is a friendly one; this recipe gives you both camps and lets your table decide. The real secret of a great tortilla is older than the argument: the potatoes are confit — barely simmered in olive oil until tender and glassy, never fried crisp — and the flip, the *vuelta*, is the rite of passage every Spanish cook goes through. Done with a plate and a steady wrist, it is far less dangerous than it looks, and this recipe walks you to it with checkpoints: the slide test, the set edges, the clean landing. What you earn is the real thing — a golden disk with a custardy heart, eaten warm or at room temperature, at any hour, cut in wedges from the same pan.


Active time	About 30 minutes
Difficulty	Moderate — the flip is technique, not luck
Key techniques	Confit potatoes in olive oil; the plate flip; the rest
Make-ahead	Excellent — traditional serving is room temperature
Pan	24 cm nonstick or very well-seasoned skillet

Quantities live in the recipe card.

The confit

low oil heat, never frying.

the debate lives here; omit for the purist version
see Chef's Note)

The egg

To cook

- Salt goes into the egg mix, never onto the raw potatoes alone: the eggs carry the seasoning and the potatoes drink it evenly. - Equipment: a 24 cm nonstick or well-seasoned skillet; a plate slightly larger than the pan (the flip partner — test it fits now, not at the flip); a wide bowl; a mandoline is welcome but a knife works. - Slice the potatoes 3–4 mm thick — thin enough to confit through, thick enough to stay as distinct slices. - **The timeline:** confit 20 minutes, egg mix and rest 10 minutes, first side 6 minutes, flip, second side 4 minutes, rest 5–10 minutes. Total about an hour, most of it unattended.

Step 1. Confit the potatoes. Slice the potatoes (and onion, if using) and put them in a wide pan with the 400 ml of olive oil while it is still cold. Set over medium-low until the oil shimmers with small, lazy bubbles — around 85–95 °C (185–200 °F), a bare murmur, never a fry — and cook gently for 18–20 minutes, turning once, until the potatoes are tender through and the slices look glassy at the edges with no color. edges are translucent, and nothing is brown. Color means the oil is too hot: this is a confit, not a fry. Checkpoint — a knife slides into a slice with no resistance, the Chef’s Note — strain the drained confit oil through a fine sieve into a jar. The potatoes absorbed maybe 30 g of it; what remains — oil perfumed with potato and onion — is the best frying oil in your kitchen, good for two or three more uses.

Step 2. Drain. Lift the potatoes and onion from the oil with a slotted spoon into a colander set over a bowl — keep the oil; it is liquid gold (see Chef's Note). Let the vegetables steam off and cool 5 minutes.

Step 3. The egg mix. Beat the eggs with the salt in a wide bowl, add the warm (not hot) potatoes, and fold gently to coat without mashing the slices. Rest 10 minutes — the starchy potatoes thicken the egg and bind the disk. tilted, with egg just visible between the slices, not pooling. Checkpoint — the mixture holds together loosely when the bowl is Chef’s Note — the onion question, settled politely: if you use it, confit it with the potatoes and let it go fully sweet and translucent (the full 20 minutes). Pale, crunchy onion in a tortilla is the one thing both camps agree on: wrong.

Step 4. First side. Heat 2 tbsp of the reserved oil in the 24 cm skillet over medium-low. Pour in the mixture and smooth the top. Cook 5–6 minutes, shaking the pan gently twice, until the edges are set and pale golden and the bottom is golden. the edges look set and slightly pulled from the sides. If it sticks at the center, give it one more minute. Checkpoint — the tortilla slides in the pan when you shake it, and Chef’s Note — medium-low is the whole game here: a hotter pan sets the outside before the center warms, and the disk domes and cracks at the flip. The slide test exists because a tortilla that slides has set enough to survive the vuelta.

Step 5. The flip. Set the plate face-down over the pan, hold them together firmly, and invert in one confident motion. Lift the pan away, slide the tortilla back in uncooked-side down, and tuck any overhang under with a spatula. Checkpoint — the landed tortilla is a clean disk, golden side up. Chef’s Note — the flip is confidence, not speed: plate centered, both hands, one motion, and pause a beat before inverting so nothing shifts. Do it once over the sink the first time and the fear is gone forever.

Step 6. Second side. Cook 3–4 minutes for *juguosa* — the creamy, barely-set Spanish center that trembles when the pan is nudged — or 5–6 minutes for fully set. Slide onto a plate and rest 5–10 minutes before cutting; the rest finishes the interior and firms the slice. version the interior sits around 68–70 °C / 154–158 °F). **Safety —** for the very creamy style, use pasteurized eggs if serving young children, anyone pregnant, or anyone immunocompromised. Checkpoint — the center reads custard, not liquid (for the creamy

Doneness & Quality Checkpoints

Potatoes: tender through, glassy-edged, zero color — the confit rule.
Egg set ladder: *juguosa* (trembling custard center), *media* (barely
The flip: clean disk, no cracks, no scramble patches.
The rest: 5–10 minutes minimum; a tortilla cut straight from the pan
The reserved oil: clear and faintly golden after the cook — cloudy,
Color: golden exterior, no brown patches — brown means the pan ran hot.

Tortilla de Patatas

Prep: 20 minutes · Cook: 45 minutes · Total: About 1 hour 5 minutes, plus resting · 4

Ingredients

The confit

700 g waxy potatoes, peeled
1 medium onion (200 g), halved and sliced thin — the debate lives here; omit for the purist version
400 ml / 370 g extra-virgin olive oil (it is strained and reused — see Chef's Note)

The egg

6 large eggs (300 g, shelled)
8 g fine sea salt

To cook

2 tbsp (30 g) of the reserved confit oil

Instructions

Confit the potatoes. Slice the potatoes (and onion, if using) and put them in a wide pan with the 400 ml of olive oil while it is still cold. Set over medium-low until the oil shimmers with small, lazy bubbles — around 85–95 °C (185–200 °F), a bare murmur, never a fry — and cook gently for 18–20 minutes, turning once, until the potatoes are tender through and the slices look glassy at the edges with no color. edges are translucent, and nothing is brown. Color means the oil is too hot: this is a confit, not a fry. Checkpoint — a knife slides into a slice with no resistance, the
Drain. Lift the potatoes and onion from the oil with a slotted spoon into a colander set over a bowl — keep the oil; it is liquid gold (see Chef's Note). Let the vegetables steam off and cool 5 minutes.
The egg mix. Beat the eggs with the salt in a wide bowl, add the warm (not hot) potatoes, and fold gently to coat without mashing the slices. Rest 10 minutes — the starchy potatoes thicken the egg and bind the disk. tilted, with egg just visible between the slices, not pooling. Checkpoint — the mixture holds together loosely when the bowl is
First side. Heat 2 tbsp of the reserved oil in the 24 cm skillet over medium-low. Pour in the mixture and smooth the top. Cook 5–6 minutes, shaking the pan gently twice, until the edges are set and pale golden and the bottom is golden. the edges look set and slightly pulled from the sides. If it sticks at the center, give it one more minute. Checkpoint — the tortilla slides in the pan when you shake it, and
The flip. Set the plate face-down over the pan, hold them together firmly, and invert in one confident motion. Lift the pan away, slide the tortilla back in uncooked-side down, and tuck any overhang under with a spatula. Checkpoint — the landed tortilla is a clean disk, golden side up.
Second side. Cook 3–4 minutes for *juguosa* — the creamy, barely-set Spanish center that trembles when the pan is nudged — or 5–6 minutes for fully set. Slide onto a plate and rest 5–10 minutes before cutting; the rest finishes the interior and firms the slice. version the interior sits around 68–70 °C / 154–158 °F). **Safety —** for the very creamy style, use pasteurized eggs if serving young children, anyone pregnant, or anyone immunocompromised. Checkpoint — the center reads custard, not liquid (for the creamy

Finish & Plate

Cut into wedges like a cake and serve warm or at room temperature — in Spain the tortilla is as much a 6 p.m. pincho as a dinner, eaten from a skewer in a bar or from a plate at home. Good bread, a tomato salad, and nothing else is required. A wedge in a baguette, the *bocadillo de tortilla*, is a national institution — and leftover wedges, crisped cut-side down in the reserved oil, make the best breakfast in Spain.

Troubleshooting

Symptom	Cause	Fix
The flip breaks	Edges under-set, or a too-small plate shifted the disk	Wait for the slide test; use a plate wider than the pan; patch and tuck — most repairs hide under the second-side color
Potatoes browned and crisp	Oil too hot — it fried instead of confit	Keep the oil at a bare murmur; the potatoes should look glassy, not golden
Rubbery, bouncy texture	Overcooked egg	Pull it 1–2 minutes earlier; the carryover during the rest finishes the center
Oily, heavy slices	Potatoes not drained, or the mix stood too long before cooking	Drain well in the colander; cook the mix within 15 minutes of combining
Falls apart when cut	No rest, or too little egg for the potato	Rest 5–10 minutes; the ratio here (6 eggs to 700 g potato) is deliberately generous
The disk domes and cracks at the flip	Center still cold while the outside over-set	The slide test plus a gentle pan-shake warms the center; give the first side one more full minute
Onion stays crunchy	Added late, sliced thick, or cooked at a color-heavy heat	Confit the onion the full 20 minutes with the potatoes — it should dissolve into sweetness

Storage, Make-Ahead & Variations

- Room temperature is traditional: covered, it holds beautifully for 4–6 hours — picnic food by design. Refrigerate up to 2 days; bring to room temperature or warm gently in a low oven. - The confit oil is strained and reused: potato-egg oil is the best oil in your kitchen now. Keep it in a jar for frying potatoes or dressing — up to 3 uses. - Tortilla de patatas con cebolla — the version above. Sin cebolla — omit, and add 100 g more potato. - Tortilla francesa: same eggs, no potato, in the same pan — breakfast in three minutes. - Chorizo chips scattered warm over a wedge is a Madrid-bar move that works.