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How to Make a Watermelon Cake Design

Watermelon Cake Design

Hi friends! It’s officially summer with brutal hot days here in Houston. We have not seen rain that much this summer. But no worries, we have summer fruits such as juicy watermelons to keep us cool and hydrated! There are many different ways to do a watermelon cake, so here is my watermelon cake idea! This watermelon cake will be a hit for a watermelon birthday cake or at your summer party! Scroll down for a list of supplies and a step by step instructions on how to make this watermelon cake design.

Watermelon Cake Tutorial

Watermelon cake idea

What You will need to make Watermelon Cake

Top view of the watermelon cake

Watermelon Cake Design Instructions

White Buttercream Cake
  1. Bake your delicious cake recipe or a summer cake recipe using a stand mixer and pour the cake batter into the 6-inch round cake pans.
  2. Let the cake cool for 10 minutes then take the cake layers out of the pans.
  3. Cut the top using a serrated knife or a cake lever if there is a significant dome.
  4. Make your preferred buttercream.
  5. Use four separate bowls to color the buttercream green, lime green, deep pink, and white (No coloring needed).
  6. I used a small drop of red to the deep pink buttercream to get darker deep pink.
  7. Crumb coat the cake with white buttercream covering all of the naked spots using an offset spatula.
  8. Use the cake comb to smooth the cake. Fill in the holes with buttercream until you get a smooth coat.
  9. Place the cake in the fridge until cold.
  10. Place all of the buttercreams in piping bags and snip the tip off large enough to pipe on the cake.
Watermelon buttercream colors
  1. Start with the dark green and start piping at the bottom of the cake.
Piping green buttercream on the cake
Piping green buttercream on the cake
  1. Do one row of lime green above the green buttercream.
Piping light green buttercream on the cake
  1. Apply one row of white buttercream above lime green buttercream.
Piping white buttercream on the cake
  1. Pipe the deep pink on the rest of the cake.
Piping deep pink buttercream on the cake
Piping the cake
Progress photo of the watermelon cake
Watermelon cake and scraper
  1. Use the cake scraper to smooth the cake and blend the colors.
  2. Pipe in the gaps with the same color buttercream.
Filling the gaps with buttercream
  1. Continue smoothing the cake with the cake scraper until you are satisfied with the results.
Scraping the cake
  1. Pipe the top of the cake with the deep pink buttercream and smooth with the small offset spatula.
Watermelon cake
Smoothing with an offset spatula
  1. Place it back in the fridge to let the cake firm up for 15 minutes or until cold.
  2. Run a knife under the hot water and cut off the excess buttercream on the top to make sharp edges.
Hot Knife scraping the edge of the cake

White Cake Drip Instructions

white chocolate & heavy cream
  1. Place 3 oz of white chocolate melts in a small bowl and pour 1 oz of heavy cream
white chocolate & heavy cream
  1. Microwave for 30 seconds and 15-second intervals until melted.
Stirring chocolate
  1. Let it rest for 5-10 minutes. You don’t want it to be too hot to melt the cake or too cold. It should be warm to the touch.
  2. Pour it into a tipless piping bag (my preferred piping bag for drips but a regular small piping bag should work)
Pouring white chocolate in the piping bag
  1. Apply chocolate to the cake starting on the top and then on the sides using various pressures while squeezing the piping bag. I usually count up to 5-7 seconds per drip. Less time if the chocolate is runnier than usual.
Applying white chocolate drip

How To Do Watermelon Toned Buttercream

  1. Lay out some cling wrap. Using the leftover green, lime green, and deep pink and pipe alternating the colors like below. Repeat for another layer on top of the colors.
Piping Colors on cling wrap
Piping colors
  1. Wrap the cling wrap and snip off the end with a pair of scissors.
Cling wrapped watermelon buttercream
  1. Fit a piping bag with a 2D piping bag and put the cling-wrapped buttercream into the piping bag.
Multi-colored watermelon buttercream piping bag
  1. Start piping buttercream swirls on the top of the cake. Apply sprinkles on the top of the swirls as desired.
Piping Watermelon buttercream swirls
  1. Apply the black sprinkles to the cake for the final touch!
Putting on black sprinkles on the cake
Watermelon Cake

I hope you found this watermelon cake design tutorial useful! Please tag me on Instagram or Pinterest!) or comment below if you found it useful. Thanks so much for reading along.

How To Make Watermelon Cake
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