Preheat the oven to 325 degrees F. Grease and flour a large tube pan. We used a 10 inch bundt pan.
In a separate bowl add the cake flour, baking powder, salt and cocoa powder. Whisk to combine and set aside.
Add the butter to the bowl of your mixer, mix until smooth. Gradually add the sugar and mix until fluffy and lightened in color, this will take 3 to 5 minutes.
Add the eggs one at a time, mixing after each until the yellow of the yolk has blended.
In a small bowl or measuring cup, combine the vanilla, white vinegar, and red coloring to the heavy/whipping cream. The mixture will thicken as the vinegar reacts to the cream.
With an electric mixer on low speed (with paddle attachment if using a stand mixer), alternately add the flour mixture and the whipping cream mixture. Begin and end with the flour mixture. (We do three additions of dry ingredients and 2 of wet.) Pour into prepared bundt pan.
Bake at 325 degrees for 1 hour and 10 minutes, or until a long wooden skewer or toothpick comes out clean or with just a few crumbs attached. Ovens bake differently so check at around the 1 hour mark and adjust the baking time as needed.
Allow the pound cake to cool in the pan for 10 minutes before turning out.
Cream Cheese Frosting
Cut the butter into slices and add to the bowl of your mixer. Beat on low to medium speed until the butter is softened and smooth.
Cut the cold cream cheese into pieces and add to the butter, beating at low to medium speed until incorporated. If you are using a hand mixer you may need to soften the cream cheese a bit more.
Add the vanilla. Gradually add the powdered sugar beating on low speed until blended. Cover the bowl with a towel to keep down the cloud of powdered sugar.
Increase mixing speed and beat until fluffy. Don't over beat or it will become too soft. If it becomes too soft, just refrigerate a short while to firm it up a bit.
This frosting will pipe best if used while still chilled. You can make it in advance, refrigerate and when ready to use let it soften slightly (do not microwave) and remix.
Decorating the CakeWe used our large star tip (1M) to pipe rosettes and stars over the top of the cake with the cream cheese frosting. If it is too soft, chill in the refrigerator for a few minutes. You can also spread the frosting on top of the cake with an offset spatula. (This is a half batch of our cream cheese frosting recipe).