
Few dishes are as satisfying as a thick, golden egg-and-potato cake that works just as well at a dinner party as it does cold from the fridge the next morning. This classic Spanish preparation layers tender Yukon Gold potatoes and sweet slow-cooked onion into a rich, custardy egg base that sets into something genuinely beautiful. Every single ingredient here is naturally free from celery and celery derivatives, so there's no need to scan labels or swap anything out — the recipe just works as written. The key is patience during that low-and-slow potato cook, which coaxes out a buttery softness that makes the finished tortilla feel almost luxurious. The confident flip is the only moment that requires a little nerve, but once you nail it, you'll want to make this every weekend. A scatter of fresh parsley at the end adds a bright, herby finish without complicating a dish that's already perfect in its simplicity. Serve it warm, at room temperature, or straight from the fridge — it genuinely doesn't matter, because it's delicious every single way.
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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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