Preheat oven to 350 deg.
Add eggs, buttermilk, water, oil, and vinegar to cake mix in large bowl and combine w/ electric mixer. Turn off mixer, then add food coloring, Beat 2 min.on high, then pour into greased and floured Bundt pan. Bake 30-40 min. Cool 30 min., then remove from pan.
To frost, mound cream cheese frosting over top third of cake and let it drip down.
Garnish. Refrigerate up to 24 hours under glass cover.
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