This cake celebrates the flavors of lemon and blueberry and can be made in a variety of shapes. The cake is lemon flavored (from lemon zest and juice), and the frosting is intensely blueberry-flavored from the addition of freeze-dried blueberries. It is the perfect celebration cake for spring!
Heat oven to 350°F. Grease three 6-inch round cake pans with cooking spray. Cut three 6-inch rounds of parchment paper and place one in the bottom of each pan.
In a large bowl, beat cake mix, water, eggs, vegetable oil, sour cream, lemon zest, and lemon juice with an electric mixer on medium speed for 2 minutes. Divide batter evenly among cake pans. Bake about 25 minutes or until light golden brown and a toothpick inserted in the center comes out clean. Cool in pans for 10 minutes. Remove from pans to a cooling rack. Cool completely, about 1 hour.
Place freeze-dried blueberries in a food processor. Cover; process until blueberries are a fine powder. Set a fine mesh strainer over a medium bowl. Pour blueberry powder through the strainer. Discard any pieces left in the strainer. Add frosting, vanilla bean paste, and salt to the blueberry powder. Mix thoroughly.
Place one cake layer on a serving plate. Spread a layer of frosting over the top of the cake. Spread half of the lemon curd over the frosting, leaving a 1/2-inch border around the edge of the cake. Top with a second cake layer; repeat with frosting and remaining lemon curd. Top with the third cake layer. (If the cake feels unstable or the layers want to slide, insert a couple of disposable straws into the cake as dowels to help hold the cake layers in place.) Frost the entire cake as desired with the remaining frosting. Just before serving, decorate with fresh blueberries and lemon slices.
This cake can be made in a variety of pans. Grease two 8- or 9-inch round cake pans or one (13x9-inch) pan with cooking spray and line the bottoms of the pans with parchment paper. To use a fluted tube cake pan, thoroughly spray with cooking spray and dust with flour. Follow the instructions on the cake mix box for bake times.
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