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1
Bring a pot of water to a boil. Salt generously and add the vinegar. Add the potatoes whole and cook until just tender when pierced, about 20 minutes. Drain and pat dry.
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2
Heat the olive oil in a heavy skillet over medium-high heat (around 190°C / 375°F). Add the potatoes and fry, turning occasionally, until lightly browned on the exterior, about 5 minutes.
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3
Add the sliced onions and chile powder. Fry for another 5 minutes, stirring frequently to prevent the chile from scorching.
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4
Remove from the heat, add the lime juice, toss to coat, and serve immediately while warm, with toothpicks alongside.