INGREDIENTS
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2 tablespoons unsalted butter, softened, plus a bit for the pan
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3/4 cup granulated sugar
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1/4 cup all-purpose flour
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3 large eggs at room temperature, separated
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1/2 cup limeade concentrate, thawed
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3/4 cup canned unsweetened coconut milk
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1/4 teaspoon fine salt
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Toasted coconut, for garnish, optional