"This whimsical rainbow cake doesn't require any special equipment -- just a simple Bundt pan. Dyed shredded coconut achieves those iconic ROYGBIV blocks of color -- so no painstaking decorating necessary...."
INGREDIENTS
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2 sticks (1 cup) unsalted butter, at room temperature, plus more for the pan
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1 3/4 cups all-purpose flour, plus more for the pan (see Cook's Note)
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1/4 teaspoon fine salt
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1 tablespoon milk, at room temperature
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2 teaspoons pure vanilla extract
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4 large eggs plus 1 yolk, at room temperature
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1 1/3 cups sugar
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3 cups sweetened flaked coconut
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Red, yellow, green and blue food coloring, for the coconut
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One 16-ounce can vanilla frosting
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12 regular marshmallows