For the frosting, I went with a simple mascarpone whipped cream. It’s an amazing, thick whipped cream frosting that is not too sweet. You could also use my lemon buttercream frosting.
Chill the bowl: I recommend placing a metal mixer and the whisk in the freezer for 5-10 minutes prior to starting. Also keeping your ingredients refrigerated up until you’re ready to use them.
Let the Mascarpone turn to liquid. Spoon the cold mascarpone whipped cream into your bowl and beat on a medium-low speed. Slowly pour in the heavy cream, allowing the mascarpone cheese to turn to a liquid consistency.
Beat on high speed. Then increase the mixing speed to high (speed 8-10) and beat it until soft peaks form.
Add the sugar. Next, add the powdered sugar and vanilla extract, beating on low until sugar is incorporated. Then continue beating at a high speed until stiff peaks form.
The whipped cream will thicken pretty quickly once the mascarpone has been added. This frosting is very light and it’s not overly sweet so it allows the flavors of the cake to really shine through.
Assemble the Cake Layers
Now it’s time to assemble your lemon blueberry cake! If the layers are not all the same thickness, place your thickest and flattest layer on the bottom.
Frost the first layer. First, pipe a layer of the mascarpone whipped cream and spread evenly. Using a piping bag helps to ensure an even distribution of frosting.
Add lemon curd. Then spread a layer of lemon curd (about half the jar). Don’t spread the lemon curd all the way to the edges, stop about ½ inch from the edge
Add the next layer of cake on top. Press it into layer below. Try your best to place it centered and not leaning to one side or the other.
Invert your top layer. So the actual bottom of the cake layer is on top, giving you a nice flat surface on the top of your cake.
Decorate
I decorated this with a thin layer of mascarpone frosting, you can see it’s a little bit rustic. Use any leftover frosting to decorate this cake. I used a large open round piping tip. Then you can garnish this cake with fresh fruit like lemon slices and more fresh berries.
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