Blackberry Frosted Key Lime Cake

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Blackberry Frosted Key Lime Cake

Key Lime Cake with Blackberry Frosting

A Key lime cake with Key lime curd and blackberry frosting made with frozen berries in the center and whipped cream frosting on the exterior.

Total Time:

2 hrs 25 mins


1 8-inch layer cake

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  • 2 cups all-purpose flour

  • 1 teaspoon baking powder

  • ¾ teaspoon baking soda

  • ½ teaspoon salt

  • 1 ½ cups white sugar

  • ½ cup unsalted butter, at room temperature

  • 3 large eggs

  • 1 cup buttermilk

  • 2 tablespoons Key lime zest

  • 2 tablespoons Key lime juice

Key Lime Curd:

Blackberry Buttercream Frosting:

  • 1 ½ cups frozen blackberries

  • 3 tablespoons Key lime juice

  • ½ cup unsalted butter, at room temperature

  • 2 cups powdered sugar

  • ½ teaspoon vanilla extract

  • 1 teaspoon milk, or more as needed

Whipped Cream Frosting:

  1. Preheat the oven to 350 degrees F (175 degrees C). Line the bottom of two 8-inch round cake pans with parchment paper. Place a mixing bowl and beaters into a refrigerator to chill for whipped cream frosting.

  2. Whisk flour, baking powder, baking soda, and salt together in a bowl.

  3. Combine sugar and butter in the bowl of an electric stand mixer and beat at medium speed until mixture is creamy and smooth, 5 to 10 minutes. Meanwhile, beat eggs in another bowl until foamy.

  4. Slowly add beaten eggs to the bowl of the stand mixer and reduce speed to low. Add dry ingredients in small increments, alternating with buttermilk, until just combined. Add lime zest and juice and mix just until combined. Pour 1/2 of the batter into each prepared cake pan.

  5. Bake in the preheated oven until a toothpick inserted into the center of the cakes comes out clean, 15 to 20 minutes. Let cool completely in the pans on wire racks before removing, about 30 minutes.

  6. While cakes are cooling, make the curd. Add sugar, butter, lime juice, and zest to the top of a double boiler filled with at least 1 inch of water in the bottom. Set heat to medium and mix until butter melts. Add 2 tablespoons of the mixture to the beaten eggs and stir until combined. Reduce heat on the double boiler until water is simmering; add eggs and mix until curd coats the back of a wooden spoon, 20 to 25 minutes.

  7. Let curd cool slightly, about 10 minutes. Transfer to a glass container and refrigerate until needed.

  8. For the frosting, combine blackberries and lime juice in a small saucepan over medium heat. Cook and stir for 20 minutes. Strain the mixture; if less than 3 tablespoons of liquid results, add small amounts of water to the pulp until 3 tablespoons is achieved. Allow juice to cool to room temperature, about 10 minutes.

  9. Pour blackberry juice and butter into a mixing bowl and beat until creamy. Slowly add powdered sugar and vanilla extract and beat to a thick consistency. Add milk and beat until combined.

  10. Remove chilled mixing bowl and beaters from the refrigerator. Add heavy cream and beat until cream is frothy. Slowly add powdered sugar and vanilla extract while beating; beat until frosting can hold stiff peaks.

  11. To assemble, add a layer of blackberry frosting to the bottom cake layer. Pipe a spiral of blackberry frosting with 1 to 2 inches of space between rings; this will keep the cake from shifting when it’s cut. Fill the space between the rings with curd. Refrigerate the cake to allow buttercream to firm up, 10 to 20 minutes.

  12. Place the second layer of cake on top of the spiral, then coat the whole cake in a generous layer of whipped cream frosting.

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Nutrition Facts (per serving)

720Calories37g Fat95g Carbs7g Protein
Nutrition FactsServings Per Recipe12Calories720% Daily Value *Total Fat37g47%Saturated Fat22g111%Cholesterol184mg61%Sodium286mg12%Total Carbohydrate95g35%Dietary Fiber2g6%Total Sugars75gProtein7gVitamin C13mg65%Calcium104mg8%Iron2mg9%Potassium178mg4%

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