
Few dishes are as satisfying as a thick, golden wedge of this classic Spanish egg-and-potato cake, and the ingredient list is refreshingly short. Yukon Gold potatoes are slowly coaxed tender in good olive oil alongside sweet sliced onion, building a rich, almost buttery base before a single drop of egg ever hits the pan. The eggs bind everything together into something that is simultaneously silky and substantial — comfort food in the most elegant sense. Because the whole recipe relies on whole eggs, fresh potatoes, onion, olive oil, and a little seasoning, there are no hidden fillers, flours, or legume-based additives to worry about, making it a naturally clean choice for anyone avoiding lupin. The flip is the one moment that demands a little nerve, but the instructions walk you through it clearly, and the payoff is a beautifully set tortilla with a just-custardy center. It slices into neat wedges and tastes just as good at room temperature as it does warm, which makes it perfect for a relaxed brunch spread or a light dinner with a simple salad alongside.
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Heat the olive oil in a 10-inch nonstick skillet over medium-low heat until it shimmers. Add the potato slices and onion, season with ½ tsp of the salt, and stir gently to coat. Cook, turning the potatoes occasionally with a slotted spoon, until the potatoes are completely tender and yield easily when pressed with the back of a spoon, about 20–25 minutes. They should be soft but not browned.
Use a slotted spoon to transfer the potatoes and onion to a large mixing bowl, leaving as much oil behind in the skillet as possible. Reserve 2 tbsp of the cooking oil in the skillet and discard the rest (or save for another use).
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