
Few dishes capture the soul of a simple, satisfying meal quite like this classic Spanish egg and potato cake. Thin-sliced Yukon Golds and sweet yellow onion are slowly coaxed in olive oil until meltingly tender, then folded into beaten eggs and cooked into a thick, golden round that's custardy in the center and just set at the edges. The whole thing comes together with pantry staples and zero meat, making it a naturally complete vegetarian meal without any substitutions or workarounds required. The flip is the one moment that demands a little nerve, but the instructions walk you through it confidently — and the payoff is a beautifully bronzed tortilla that looks far more impressive than the effort involved. Resting before slicing is the secret step that holds everything together and lets those flavors deepen. Serve it warm, at room temperature, or even cold the next day straight from the fridge — it genuinely gets better as it sits. A scatter of fresh parsley on top adds a bright finish, though the dish is absolutely stunning without it.
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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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