INGREDIENTS
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1 small sweet onion, coarsely grated
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2 tablespoons light brown sugar
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1 tablespoon distilled white vinegar
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1 tablespoon olive oil, plus more for grill
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1 1/4 pounds skirt steak, cut into 1/2-inch pieces
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Kosher salt, freshly ground pepper
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2 tablespoons finely chopped chives
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Flaky sea salt