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Preheat the oven to 350 degrees F.
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Grease and flour a bundt pan.
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Cream the butter together with 2-1/4 cups of the sugar.
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Add the flour, baking powder, and salt and mix until combined.
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Add the milk, eggs, vanilla, and orange zest.
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Pour the batter into the Bundt pan.
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Bake for 1 hour and 15 minutes, or until a toothpick comes out clean.
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Poke holes all over the cake with a toothpick and let cool thoroughly.
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Combine the orange juice and the remaining 2 cups of sugar in a small pan.
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Bring to a boil over high heat.
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Paint the sauce onto the cake with a pastry brush.