# Spanish Tortilla de Patatas with Runny Center

> Four everyday kitchen staples—Yukon Gold potatoes, sweet yellow onion, pasture-raised eggs, and extra-virgin olive oil—slowly confit and sear into a tall, burnished Spanish Tortilla de Patatas with a velvety, custardy golden interior.

- Page: https://waituntilyoutry.com/recipe-spanish-tortilla-de-patatas-with-runny-center
- Recipe film: https://www.youtube.com/shorts/-LObhLPUZCM
- Provenance: TORTILLA ESPAÑOLA JUGOSA • EST. 1798

## AUTHENTIC SPAIN RECIPE (4 generous tapas wedges)

- 650 g Yukon Gold potatoes, peeled and sliced crosswise into 3 mm coins
- 200 g (1 medium) sweet yellow onion, thinly sliced
- 6 large (300 g) pasture-raised eggs, at room temperature
- 180 ml (3/4 cup) Spanish extra-virgin olive oil
- 8 g (1 1/2 tsp) flaky sea salt
- 5 g (1 tbsp) fresh chives, finely sliced crosswise into rings (optional garnish)

## How to make it

1. Slice the Potatoes Crosswise & Prep the Onion: Peel 650 g (4 medium) waxy Yukon Gold potatoes, rinse briefly, and pat thoroughly dry with a clean kitchen towel so the oil will not splatter. Using a sharp chef's knife, slice the potatoes crosswise into uniform 3 mm (1/8-inch) circular coins, and thinly slice 200 g (1 medium) sweet yellow onion.
2. Poach the Potatoes & Onion in Olive Oil (Confit Method): Pour 180 ml (3/4 cup) extra-virgin olive oil into a deep 24 cm (9.5-inch) skillet over medium-low heat until the oil reaches 130°C–140°C (265°F–285°F). Slide in the potato coins and sliced onions with 4 g (3/4 tsp) sea salt. Simmer gently for 15 to 18 minutes, turning occasionally with a wooden spatula so the potatoes soften until tender and fudgy without crisping or browning.
3. Drain and Cool Slightly: Pour the tender potatoes and translucent caramelized onions into a fine-mesh colander set over a heatproof bowl to capture every drop of the flavorful infused olive oil. Let the vegetables cool for 4 minutes to around 55°C (130°F) so they warm the eggs without scrambling them on contact.
4. Fold into Beaten Eggs & Macerate for 15 Minutes: Whisk 6 large room-temperature eggs in a wide mixing bowl with the remaining 4 g (3/4 tsp) flaky sea salt until homogenous but not frothy. Gently fold the warm confit potato coins and onions into the beaten eggs, pressing lightly with the back of a spatula so a few potato edges break down and thicken the egg. Let the mixture sit at room temperature (21°C / 70°F) for 15 minutes so the potatoes absorb the seasoned egg.
5. Sear the First Side & Shape the Drum Edge: Heat 15 ml (1 tbsp) of the reserved potato-infused olive oil in a 20 cm (8-inch) seasoned cast-iron or non-stick skillet over medium heat (170°C / 340°F) until shimmering. Pour in the entire egg-and-potato mixture at once. Cook for 60 seconds while stirring the center lightly, then lower the heat to medium-low (150°C / 300°F) and cook undisturbed for 2 minutes, running a heatproof spatula around the perimeter to tuck the edges inward into a tall, rounded drum.
6. Execute the Plate Flip for a Runny Center (Jugosa): When the bottom is golden-brown and the top 5 mm remains glossy and liquid, invert a flat dinner plate over the skillet and flip the pan decisively in one smooth motion so the tortilla lands golden-side up on the plate. Add 5 ml (1 tsp) reserved olive oil to the skillet, slide the tortilla back in uncooked-side down, tuck the bottom edge neatly with your spatula, and cook for only 60 to 90 seconds so the center reaches 64°C–66°C (147°F–150°F)—thick, custardy, and velvety.
7. Rest 5 Minutes & Slice the Creamy Wedge: Invert the finished Tortilla de Patatas onto a warmed ceramic serving plate and let it rest for 5 minutes so the molten egg custard stabilizes around the tender potato layers. Garnish with a pinch of flaky sea salt and finely crosswise-snipped fresh chives, then slice a triangular wedge to reveal the warm, creamy golden interior.

## History

First documented in 1798 in Villanueva de la Serena, Extremadura, Spain, Tortilla de Patatas became Spain's national tavern dish by gently poaching potatoes in olive oil before binding them in beaten eggs.

## Fun fact

Soaking the warm olive-oil-poached potatoes directly in the raw beaten eggs for 15 minutes before cooking allows potato starch and pectin to dissolve into the albumen, preventing the egg from scrambling and creating the prized 'jugosa' custard center!

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## Spanish Tortilla de Patatas with Runny Center: The Classic Potato Omelette, Explained

### What is Spanish tortilla de patatas?

*Tortilla de patatas*—also called *tortilla española*—is Spain's national omelette, made from thinly sliced potatoes slowly poached in olive oil and bound with beaten eggs into a thick, golden cake. Unlike a folded French omelette, a Spanish [tortilla de patatas](https://en.wikipedia.org/wiki/Spanish_omelette) is cooked in a deep skillet, inverted onto a plate halfway through, and slid back into the pan so both faces form a smooth, amber crust.

In northern Spain—particularly in [Betanzos](https://en.wikipedia.org/wiki/Betanzos) in Galicia and across the [Basque Country](https://en.wikipedia.org/wiki/Basque_cuisine)—cooks prize the *tortilla poco hecha* or *jugosa*: a tortilla whose exterior holds its drum shape while the center stays lush, creamy, and softly flowing when sliced open.

### Where does tortilla de patatas come from?

Historians trace the earliest written record of the potato tortilla to [Navarre](https://en.wikipedia.org/wiki/Navarre) and Extremadura in the late 18th century. For decades, popular folklore attributed the dish to Carlist general Tomás de Zumalacárregui during the siege of Bilbao in 1835. However, Spanish food historian Javier López Linage uncovered a 1798 document from [Villanueva de la Serena](https://en.wikipedia.org/wiki/Villanueva_de_la_Serena) in Badajoz describing a nutritious potato-and-egg tortilla preparation almost four decades before the Carlist Wars.

Potatoes themselves had arrived in Spain from South America in the 16th century, as documented in agricultural histories of the [potato](https://en.wikipedia.org/wiki/Potato), initially grown as botanical curiosities and livestock feed before becoming a staple of Iberian home cooking by the 1790s.

### With onion or without onion: the great Spanish debate

Few culinary questions divide Spain more reliably than *con cebolla* (with onion) versus *sin cebolla* (without onion). In a national survey conducted by Spain's [Centro de Investigaciones Sociológicas](https://en.wikipedia.org/wiki/Centro_de_Investigaciones_Sociol%C3%B3gicas) on Spanish gastronomy and tourism, just over 70% of respondents stated that true tortilla de patatas should be made with caramelized onion, while around 21% defended the purist potato-only school.

| Style | Regional Stronghold | Texture & Flavor | Key Technique |
|---|---|---|---|
| *Con cebolla* (With onion) | Home kitchens across Madrid, Andalusia, Catalonia | Sweet, moist, savory depth; stays tender even at room temperature | Thinly julienned yellow onion poached slowly with the potatoes |
| *Sin cebolla* (Without onion) | Betanzos (Galicia) and traditional competitions | Pure potato-and-egg flavor, custardy and flowing | Paper-thin potato slices fried until crisp-edged, bound with extra yolks |

Adding thinly sliced yellow onion halfway through the potato poaching stage lets the onion soften and caramelize in the warm olive oil without burning before the potatoes are tender.

### Why must you soak the warm potatoes in the beaten eggs before cooking?

The single biggest mistake home cooks make with Spanish tortilla is tipping drained potatoes straight from the colander into the hot skillet and pouring raw beaten eggs over them. When you do that, the eggs run to the bottom of the pan and set into a dry rubbery layer while the potatoes sit loose inside.

Instead, transfer the warm, drained olive-oil-poached potatoes and onions directly into the bowl of beaten eggs, fold them together gently so a few potato edges break and release starch, and let the mixture rest for 10 to 15 minutes. As the warm potatoes cool in the raw egg bath, they absorb the seasoned egg and release gelatinized potato starch, creating a thick, cohesive batter before it ever touches the pan.

According to food-science data on [egg protein coagulation](https://www.ifst.org/lovefoodlovescience/resources/protein-coagulation), whole egg mixtures begin to thicken around 65°C (149°F) and set firmly above 70°C (158°F). Because the potato-and-egg mixture enters the pan already warm and starchy, a brief sear over medium heat sets the outer 5 mm shell while leaving the center at a creamy 63°C–65°C (145°F–149°F) custard.

### How do you cook a runny-center tortilla de patatas step by step?

Follow these six steps for a tall, golden 20 cm (8-inch) tortilla with a creamy *jugosa* interior:

1. **Slice the potatoes and onions:** Peel 700 g (1.5 lb) waxy Yukon Gold or Monalisa potatoes and slice them into uneven 3 mm rounds or half-moons. Thinly julienne 1 medium yellow onion (150 g) and toss the potatoes and onion with 1 teaspoon fine sea salt.
2. **Confit in olive oil:** Warm 250 ml (1 cup) [extra-virgin olive oil](https://en.wikipedia.org/wiki/Olive_oil) in a deep 20 cm (8-inch) skillet to 135°C–145°C (275°F–295°F). Slide in the potatoes first, poach gently for 10 minutes without browning, then stir in the sliced onion and cook for another 10 to 12 minutes until the potatoes break easily under a wooden spoon and the onions turn golden.
3. **Drain and reserve the oil:** Lift the potatoes and onions out with a slotted spoon or drain through a colander set over a heatproof bowl, keeping the fragrant onion-infused olive oil for searing.
4. **Rest the potato-egg batter:** Beat 6 large whole eggs plus 2 extra egg yolks in a large bowl with 1/2 teaspoon fine sea salt just until combined (do not whip foam into them). Fold the warm drained potatoes and onions into the eggs and let the mixture steep at room temperature for 12 to 15 minutes.
5. **Sear the first side:** Heat 1 tablespoon of the reserved poaching oil in a 20 cm (8-inch) well-seasoned cast-iron or nonstick skillet over medium heat until shimmering. Pour in the rested batter, stir the center gently for 10 seconds with a wooden spatula, then cook undisturbed for 90 to 120 seconds while tucking the outer rim inward with the spatula to shape its rounded edge.
6. **Flip with a plate and finish briefly:** Place a flat plate slightly wider than the pan upside down over the skillet, invert the tortilla onto the plate in one confident motion, and slide it uncooked-side down back into the pan. Cook for just 45 to 60 seconds more, tucking the edges, then turn out onto a warm terracotta plate and rest 2 minutes before slicing.

### Frequently asked questions

#### What kind of potatoes work best for tortilla de patatas?

Waxy or all-purpose yellow potatoes—such as Yukon Gold, Kennebec, or Spanish Monalisa—hold their slice shape while poaching in olive oil yet release just enough surface starch to thicken the egg batter. Very floury baking potatoes can disintegrate into mash before the onions finish cooking.

#### What do I do with the leftover olive oil after poaching the potatoes?

Strain the cooled olive oil through a fine mesh sieve into a clean glass jar and refrigerate it. Infused with sweet onion and potato flavor, you can reuse it two or three more times for future tortillas, roast vegetables, or fried eggs.

#### How do I flip the tortilla without spilling runny egg?

Use a flat rimless plate (or a dedicated *vuelcatortillas* lid) lightly brushed with a drop of olive oil, hold a folded kitchen towel over your bottom hand under the plate, and invert the pan quickly over the sink. Because the first side has cooked for 90 to 120 seconds, the bottom crust acts as a sturdy dome that holds the creamy interior on the plate.

#### Can I cook the center more firmly if I prefer a set tortilla?

Yes. Simply lower the heat to medium-low after flipping and cook for 2.5 to 3 minutes per side instead of 60 seconds, pressing gently on the center until it springs back softly like a sponge cake.

### Watch it, cook it, tell us what's next

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Published by WAIT UNTIL YOU TRY (https://waituntilyoutry.com). AI-created visuals. Culinary inspiration, not a complete cooking guide.