INGREDIENTS
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• 1-1/2 cups granulated sugar
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• Zest of 4 limes (avoid the white, pithy parts)
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• 2 large eggs, plus 2 large egg yolks
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• 1/2 cup freshly squeezed lime juice
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• 1/4 tsp kosher salt
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• 1 stick (8 T or 1/2 cup) unsalted butter, cut into 16 pieces
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• 1 tsp coconut rum (or pure vanilla extract)