
Few dishes are as deeply satisfying as this classic Spanish egg and potato cake, which layers silky slow-cooked potatoes and sweet onion into something that feels far greater than the sum of its parts. The technique is the magic here — gently poaching the potatoes in olive oil until they're meltingly tender before folding them into beaten eggs creates a custardy, rich interior that no amount of rushing can replicate. Every single ingredient in this recipe is naturally free of citrus, so there's no need to audit a label or swap anything out — just cook with confidence. The dramatic flip is the moment everyone talks about, but the real reward is that first wedge: golden on the outside, just barely set in the center, and impossibly creamy all the way through. It's equally at home as a lazy weekend brunch, a light dinner, or sliced into small squares for a crowd. A scatter of fresh parsley at the end adds a little color and freshness without complicating a dish that's already perfect in its simplicity.
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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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