INGREDIENTS
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3 tablespoons gochujang (Korean hot pepper paste), plus more for serving
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3 tablespoons olive oil, plus more for grill
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3 tablespoons plus 1/2 cup seasoned rice vinegar
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Kosher salt
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1 medium red onion, halved through root end
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1 skirt steak (about 1 pound), halved crosswise
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Warm tortillas (for serving)