01 -
Preheat the oven to 175°C. Line three 8-inch round baking pans with parchment paper and grease the sides.
02 -
In a large mixing bowl, combine sugar, vegetable oil, eggs, and lemon extract. Beat on medium speed for 2 minutes until lighter in color. Scrape down the bowl.
03 -
Zest and juice 2 lemons, obtaining 59ml lemon juice. Add zest, juice, and sour cream to the batter. Beat until combined.
04 -
In a separate bowl, combine flour, baking powder, and salt. Gradually add half the dry mixture to the batter, alternating with half the buttermilk. Repeat with remaining dry ingredients and buttermilk, mixing until well combined.
05 -
Toss blueberries with 15.6g flour. Gently fold them into the batter, reserving a handful to drop on top.
06 -
Divide batter evenly between prepared pans (about 1 2/3 cups per pan). Drop remaining blueberries on top. Bake at 175°C for 20-23 minutes, rotating pans halfway through. Check doneness with a toothpick.
07 -
Remove cakes from the oven and allow to cool completely before assembling.
08 -
Chill mixing bowl and whisk attachment for 5-10 minutes. Beat mascarpone cheese on medium-low speed, gradually adding heavy cream until the mixture liquefies. Increase speed to high and beat until soft peaks form. Add powdered sugar and vanilla; beat until stiff peaks form.
09 -
Level cake layers using a cake leveler. Place the first layer on a cake board with a dollop of frosting. Pipe a layer of frosting and spread half the lemon curd. Repeat with the second layer. Add the final layer and apply a crumb coat with frosting.
10 -
Frost the top and sides of the cake with remaining frosting, smoothing with an offset spatula. Pipe florets on the top and garnish with lemon slices and blueberries. Refrigerate immediately.