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Fantastical Food Fight: Key Lime Coconut Rum Cake

Key Lime Coconut Rum Cake is a light layer cake made with key limes and coconut rum.
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Prep Time 30 mins
Cook Time 28 mins
Total Time 58 mins
Course Cake
Servings 10 slices


for the cake:

  • 1 box white cake mix
  • 3 eggs
  • ¾ cup milk
  • ½ cup sour cream
  • ½ cup unsweetened applesauce
  • ¼ cup key lime juice
  • 2 tablespoon key lime zest

for the glaze:

  • 4 tbsp. Unsalted butter
  • ¼ cup sugar
  • 2 tablespoon key lime juice
  • ½ cup coconut rum

for the frosting:

  • 1 stick unsalted butter softened
  • ½ cup vegetable shortening
  • 1 teaspoon coconut extract
  • 1 teaspoon coconut rum
  • 4 cups powdered sugar
  • ½ cup cream of coconut*
  • ¾ cup sweetened shredded coconut
  • key lime slices


  • 1. Preheat the oven to 350 degrees. Spray 2 8-inch baking pans with baking spray or grease and lightly flour.
  • 2. In the bowl of your stand mixer, combine the white cake mix, eggs, milk, sour cream, applesauce, key lime juice and key lime zest and mix on low speed until fully combined.
  • 3. Divide the batter in half and pour each half into the prepared baking pan. Smooth the batter on top and tap the pan on the counter to remove any bubbles.
  • 4. Bake the cake for 25-28 minutes or until lightly golden and a toothpick inserted in the center comes out clean.
  • 5. Transfer the cakes to a wire cooling rack to allow to cool.
  • 6. Prepare the glaze by adding the butter to a small saucepan over medium heat and melting. Whisk in the sugar and key lime juice, whisking until the sugar dissolves. Remove from the heat and whisk in the coconut rum.
  • 7. Prick holes into the cake with a fork or toothpick and pour the glaze on top, allowing it to soak down into the cake. Let cakes soak for 10 minutes.
  • 8. Run a butter knife around the edge of the cake and invert over a plate. Repeat with the second cake. Cut off the top layer of the cake to make it even, if necessary.
  • 9. Prepare the frosting by combining the softened butter and shortening together in the bowl of a stand mixer and beating on medium high speed until light and fluffy. Add the coconut extract and coconut rum. Slowly add in the powdered sugar ½ cup at a time, alternating with the coconut cream until both are used and a thick frosting has formed.
  • 10. Spread a heaping layer of the frosting on top of one of the cooled cakes. Carefully lift up the other cake and place on top. Add more frosting to the top of the cake, leaving the sides naked. Sprinkle shredded coconut on top and then arrange lime slices on the frosting.
  • 11. Slice and serve immediately or store in the refrigerator until ready to serve.


* Cream of coconut is referred to as the solid portion when you buy a can of coconut milk from the international aisle. You can also find cream of coconut in the drink mix section but it is thinner and you'll probably need to use less. If using the canned version, make sure to only scoop out the solids otherwise your frosting will separate.
Source: Inside BruCrew Life 

Recipes on Cookaholic Wife are for information purposes only. Nutritional Data provided has not been evaluated by a nutritionist.

Keyword baking, cake, coconut rum, dessert, key lime coconut rum cake, key limes
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