Chef John's Hot Cross Buns
Ingredients:
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¼ cup dried currants
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¼ cup rum, or as needed to cover currants
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¾ cup milk, warmed to 100 degrees F/40 degrees C
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3 cups bread flour, divided, or as needed
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1 (.25 ounce) package active dry yeast
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5 tablespoons white sugar
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1 large egg, beaten
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1 tablespoon grated lemon zest
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1 tablespoon grated orange zest
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¾ teaspoon ground cinnamon
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½ teaspoon fine salt
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½ teaspoon ground cardamom
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¼ teaspoon ground nutmeg
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7 tablespoons melted butter
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¼ cup water
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⅓ cup all-purpose flour, or as needed to make thin, pipe-able dough
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¼ cup sugar
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3 tablespoons water