INGREDIENTS
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1/2 cup finely chopped fresh cilantro
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1/4 cup fresh lime juice
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1 tsp. grated peeled ginger
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1 tsp. sugar
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1/2 cup finely chopped fresh mint plus 4 sprigs for stuffing
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2 red chiles (such as Fresno or serrano), with seeds, thinly sliced, divided
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1/3 cup plus 1 Tbsp. vegetable oil
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Kosher salt
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1/4 small white onion, finely chopped
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2 whole branzino or small red snapper, cleaned
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1 lime, thinly sliced