How to Make a Stunning Rainbow Cake with Gold Ombre Layers
There's no gold waiting for you at the end of this rainbow ... but there's plenty inside!
Taste the Rainbow
Vivid rainbows that lead to a bountiful stash of gold are part and parcel of Irish folklore. What better way to celebrate St. Patrick's Day than with this showstopping layered rainbow cake with a gold ombre center? Start with the batter from this Classic White Cake recipe and this simple vanilla buttercream recipe, doubled. You'll also need: red, yellow and blue food coloring; gold sprinkles; a rotating cake stand or lazy Susan; three 8-inch round cake pans; a cooling rack; pastry bags or plastic baggies; rubber bands; a small offset spatula; scissors; a bench scraper or a large offset spatula.
Make the Batter
Mix In the Color
Add 5 drops of yellow food coloring to one bowl, then 10 drops of yellow food coloring to another. One bowl will remain white. For an extra-deep-golden layer, add 20 drops instead of 10. You can use more or less food coloring to achieve your desired results.
Pour batter into three 8-inch round cake pans that have been prepared with baking spray and bake for 16 to 20 minutes, or until cake springs back up when touched in the center and it has pulled away from the sides. Invert cakes onto a cooling rack.
Prepare the Buttercream
While cakes are cooling to room temperature, prepare the rainbow buttercream. Using 6 bowls, add 1/2 cup of buttercream to each bowl.
Red: 5 drops red food coloring
Orange: 3 drops yellow, 2 drops red
Yellow: 5 drops yellow
Green: 3 drops blue, 2 drops yellow
Blue: 2 drops blue
Purple: 3 drops blue, 2 drops red
Fill the Piping Bags
Level the Buttercream
Add the Final Layer
Crumb-Coat and Chill
Add the Beauty Layer
When you are ready to decorate the cake, cut off a very small portion from one corner of the purple frosting bag. (You can always cut off more if the hole isn't big enough to release frosting, so start small.) Now continue with the remaining bags. Place a dot of purple frosting at the base of the cake, then place a blue dot directly above it. Continue up with green, yellow, orange and finally red. You are doing this to determine spacing for your colors. If you need to adjust the spacing, gently wipe away the dots and start over.