INGREDIENTS
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1/2 small white onion, halved lengthwise, keeping root intact
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•1/2 head of garlic, unpeeled, halved crosswise
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•1 jalapeño
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•1 pound husked tomatillos
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•1 tablespoon vegetable oil
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•1/2 bunch cilantro, leaves and tender stems only and 1/4 cup fresh lime juice
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•Kosher salt, freshly ground black pepper