Rainbow Citrus Marble Cake

Celebrate the essence of joy and color with this Rainbow Citrus Marble Cake. This dessert not only offers a stunning visual display but also bursts with the refreshing tang of multiple citrus fruits, making it perfect for any gathering that calls for a touch of whimsy and a lot of flavors.


For the Cake:

  • All-purpose Flour: 6 cups
  • Kosher Salt: 1 1/2 teaspoons
  • Baking Powder: 3 teaspoons
  • Baking Soda: 3/4 teaspoon
  • Unsalted Butter: 1 1/2 cups, room temperature
  • Sugar: 3 cups
  • Eggs: 6
  • Sour Cream: 1 1/2 cups
  • Citrus Zest and Juice: 3 lemons, 3 limes, 3 oranges
  • Grapefruit Juice: 1 1/2 cups

For the Buttercream:

  • Unsalted Butter: 6 sticks, room temperature
  • Powdered Sugar: 3 pounds
  • Vanilla Extract: 2 tablespoons
  • Almond Extract: 1 tablespoon
  • Sweetened Condensed Milk: 3/4 cup
  • Salt: 3 pinches

For Decoration:

  • Gel Food Colors: Various colors (rainbow spectrum)
  • Assorted Sprinkles and Candy Pearls
  • Silver Dragees


  1. Prepare the Cake:
    • Preheat your oven to 350°F (177°C). Grease and line two 8-inch cake pans with parchment paper.
    • In a medium bowl, whisk together the flour, salt, baking powder, and baking soda.
    • In a large mixing bowl, cream the butter and sugar until light and fluffy. Add the eggs one at a time, fully incorporating after each addition. Stir in the citrus zest and juices.
    • Alternately blend in the dry ingredients and sour cream to the butter mixture, starting and ending with the dry ingredients. Finally, mix in the grapefruit juice.
    • Divide the batter into different bowls and tint each with a different gel food color to achieve a rainbow effect.
  2. Bake the Cake:
    • Pour the various colored batters into the prepared pans, using a knife to gently swirl for a marbled look.
    • Bake for about 1 hour and 15 minutes, or until a toothpick inserted in the center comes out clean.
    • Allow the cakes to cool in the pans for 10 minutes before transferring them to a wire rack to cool completely.
  3. Prepare the Buttercream:
    • In a large bowl, beat the butter until creamy. Gradually incorporate powdered sugar, then mix in vanilla, almond extract, and sweetened condensed milk until smooth. Season with a pinch of salt.
  4. Assemble and Decorate:
    • If necessary, level the cooled cakes. Stack them with a generous amount of buttercream between each layer. Cover the outside with a smooth layer of frosting.
    • Decorate with remaining buttercream tinted with colors, creating vibrant swirls. Embellish with sprinkles, candy pearls, and silver dragees for a festive finish.

Preparation Time: 20 minutes
Cooking Time: 1 hour 15 minutes
Total Time: Approximately 2 hours, excluding cooling
Servings: 10

Baking Tips:

  • Ensure all ingredients are at room temperature for better mixing and a smoother batter.
  • Intensify the citrus flavor by adding extra zest to the batter.
  • Chill the cake briefly after decorating to set the buttercream and simplify slicing.

This Rainbow Citrus Marble Cake is not just a dessert; it’s a centerpiece that promises to captivate and delight your guests. Its lively flavors and brilliant colors are perfect for any celebration, ensuring each slice brings a smile. Enjoy crafting this edible piece of art and savor the blend of sweet and tangy notes in every bite

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