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Rainbow Tie-Dye Surprise Cake

Hungry Happenings Recipe by

Rainbow Tie-Dye Surprise Cake

Cut into this neon-colored cake to reveal a tie-dye number hiding inside.

(100 comments)
  • Prep Time 2 hr 0 min
  • Total Time 9 hr 0 min
  • Servings 18
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Rainbow Tie-Dye Surprise Cake

4
(16 ounce) boxes Betty Crocker Pound Cake Mix
Eggs,
butter, and milk according to package instructions
Neon
food coloring
28
ounces fondant (your choice of colors)

Directions

  • 1 Preheat oven to 325ºF.
  • 2 Line a 16 x 4 x 4.5-inch loaf pan with non-stick aluminum foil or grease with shortening and dust with flour.
  • 3 Make cake batter using two cake mixes, according to package instructions.
  • 4 Divide batter in 5 bowls. Color one bowl neon orange, one bowl yellow, pink, blue, and green.
  • 5 Pour batter into disposable pastry bags or zip top bags.
  • 6 Drizzle colored cake batter, alternating colors into the pan until you use all the batter.
  • 7 Tap the pan on the counter a few times to remove air bubbles.
  • 8 Bake for 70-80 minutes until a toothpick inserted in the center of the cake comes out clean.
  • 9 Cool cake in pan for 20 minutes, then remove and set cake on cooling rack and cool completely.
  • 10 Cut cake into 1-inch thick slices. Lay slices flat on a baking tray and place in the freezer for at least one hour.
  • 11 Cut numbers out of cake slices. Save cake scraps for another use, and place the number pieces back in the freezer.
  • 12 Clean and prepare the loaf pan as before.
  • 13 Make the remaining two cake mixes according to package instructions.
  • 14 Pour a thin layer of cake mix into the loaf pan.
  • 15 Pour remaining batter into an 18-inch pastry bag or a gallon-size zip top bag.
  • 16 Line the number 5s in a single row down the center of the pan, piping batter into the pan as needed to keep the number pieces straight.
  • 17 Pipe the remaining batter into the pan and on top of the numbers. Be sure to mark which direction the numbers are facing and keep track of this while decorating, so you know which end of the cake to slice into and have forward-facing numbers (in this case, 5s).
  • 18 Smooth the batter.
  • 19 Bake for 70-90 minutes, rotating pan 180 degrees after 40 minutes, until a skewer or cake tester inserted into the center of the cake comes out clean.
  • 20 Cool cake completely.
  • 21 Color fondant in a variety of neon colors.
  • 22 Roll individual pieces of the colored fondant into logs. Press the logs together. Twist and fold to create a marble effect. Press fondant pieces together. Roll out to 24x15-inches.
  • 23 Cover cake with fondant.
  • 24 Create a border using a different color fondant.
  • 25 Serve the cake and slice into it, revealing the numbers.
See Step By Step

Happy Birthday, Tablespoon! Let's party with this colorful rainbow tie-dye cake hiding a special surprise inside.  

As prepared by Hungry Happenings

Have a slice of cake with Tablespoon as we celebrate 5 amazing years of recipes and fun! 

Tablespoon is turning 5 and since we're known for brightly colored rainbow foods and drinks, I thought hiding a multicolored "5" inside a Betty Crocker Pound cake was right for the occasion! And of course the exterior of the cake needed to be just as colorful – so it's covered in neon orange, yellow, green, blue and pink fondant.

The idea for this surprise reveal cake (which was inspired by Sandra Denneler’s colorful peace Tie-Dye Cake) can easily be personalized for any number birthday or occasion, and is easier to make than you'd think. With its size and scope it'll take you all day to create, but don't worry – most of that time is spent waiting for cakes to bake and cool. When you see your guests ooh and ahh over your cake, you’ll know it was totally worth it! 


Rainbow Tie-Dye Surprise Cake

You'll be baking two separate cakes, starting with the tie-dye cake. To start, whip up two batches of the Betty Crocker Pound Cake Mix then divide the batter into several bowls and color each bowl using neon food coloring. I chose to make pink, yellow, orange, blue, and green, but you can do any colors you like. 


Rainbow Tie-Dye Surprise Cake

Let your inner artist come through and drizzle layers of colored batter into a 16x4x4.5-inch loaf pan. I lined my pan with non-stick aluminum foil for easy removal, but you can grease it with shortening and dust it with flour if you prefer. 


Rainbow Tie-Dye Surprise Cake

Keep drizzling in colored batter until you use it all up. I found it easiest to put my batter into pastry bags and pipe it into the pan. You could use zip top bags if you don't have pastry bags, or you could simply drizzle it with a spoon. There's really no right or wrong way to do this step. 


Rainbow Tie-Dye Surprise Cake

Bake the cake and allow it to cool completely. While it's cooling, clean out your pan and prep it the same way for your second cake. 

Once the cake is cooled, cut it into slices that are just slightly thinner than your number 5 cookie cutter. Pop the slices in the freezer for at least an hour, until they feel frozen and firm.


Rainbow Tie-Dye Surprise Cake

Remove slices from freezer and cut one "5" out of each slice, then put them back into the freezer. You will have a lot of scraps, which could look really cool in a trifle or parfait, but they also make tasty little snacks just as they are. 


Rainbow Tie-Dye Surprise Cake

While your numbers are chilling, whip up two more batches of Betty Crocker Pound Cake Mix and pour a thin layer of it into the prepped loaf pan. Put some of the batter into a large pastry bag or gallon-size zip top bag.


Rainbow Tie-Dye Surprise Cake

Set the frozen number 5 slices, standing up, down the middle of the pan, piping in batter as needed to keep them standing up straight. 


Rainbow Tie-Dye Surprise Cake 

Make sure your slices of colored cake line up in one long row down the middle of the cake before piping batter all over the tops of the slices. Be sure to somehow mark your cake so you know which way the 5s are facing. When you cut into it later, of course you want to see forward-facing 5s. I pinched the edges of my tin foil into a horn shape to mark the right end. Keep track of this as you are decorating the cake too. 


Rainbow Tie-Dye Surprise Cake

Smooth the batter out on the top of the pan, making sure all of your 5s are covered. 


Rainbow Tie-Dye Surprise Cake

Bake the cake and be patient. This thing is huge and it will take a very long time in the oven. I suggest turning it 180 degrees after about 40 minutes so it bakes evenly. The top will begin to brown pretty early in the baking cycle, but the cake will take between 70-90 minutes to bake through. 


Rainbow Tie-Dye Surprise Cake

Once it's done, remove it from the oven, set the pan on a cooling rack and cool for 20 minutes. Remove it from the pan and set the cake directly on the cooking rack. Now, your patience is needed again as the cake needs to be completely cooled – which can take up to two hours. Once it's ready, you can trim the top to make it flat. If needed, you can trim the ends too. 


Rainbow Tie-Dye Surprise Cake

Frost the cake and smooth it out really well. Put the frosted cake in the freezer (or refrigerator if it won’t fit in your freezer) while you are coloring and prepping the fondant. This will allow the frosting to firm up a bit, making it easier to cover. 


Rainbow Tie-Dye Surprise Cake

Creating a neon rainbow tie-dye effect in fondant is fun! Roll individual colors of fondant into logs, press several together, then swirl, twist, or roll until you get a marbled effect. Don't over mix or your colors will look muddy.


Rainbow Tie-Dye Surprise Cake

Roll the fondant out into a 24-inch long by 15-inch rectangle. This will take some elbow grease!


Rainbow Tie-Dye Surprise Cake

Cover the cake with fondant and smooth it out. For detailed instructions, see my handy How to Use Fondant tutorial. 


Rainbow Tie-Dye Surprise Cake

Add a border to the cake to finish the edges. 


Rainbow Tie-Dye Surprise Cake

When you're ready to serve the cake, cut slices to reveal the number hiding inside.

Every slice will reveal another number 5!


Rainbow Tie-Dye Surprise Cake

Bright and colorful, this surprise cake is a fun way to celebrate birthdays (or any occasion) and will definitely impress your friends and family! 


Additional Fun Rainbow Recipes:

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