01 -
Preheat oven to 180°C. Grease and flour a 23x33 cm rectangular baking pan, or line three 20 cm round tins with parchment and grease and flour the sides.
02 -
In a medium bowl, sift together cake flour, baking powder, baking soda, and salt. Whisk to combine, then set aside.
03 -
In a small bowl, whisk buttermilk with freshly squeezed lemon juice and set aside.
04 -
In a large bowl, beat unsalted butter, granulated sugar, and lemon zest until pale and fluffy, about 2-3 minutes.
05 -
Beat in vanilla extract, then add eggs one at a time, mixing after each addition and scraping down the bowl as needed.
06 -
On low speed, mix in one-third of the flour mixture, then half of the buttermilk and lemon juice mixture. Repeat once, then finish with the remaining flour mixture. Scrape the bowl between additions. Avoid overmixing.
07 -
Toss blueberries with 2 teaspoons flour. Gently fold into batter with a spatula.
08 -
Pour batter into prepared pan(s). Bake 30-35 minutes for a 23x33 cm pan, or 25-30 minutes for layer cake, until set and a toothpick comes out clean. Surface should be firm and slightly springy.
09 -
Cool cakes in the pan. For layer cakes, do not attempt to invert pans while cake is still hot.
10 -
Beat softened butter until smooth, then mix in cold brick-style cream cheese. Add freshly squeezed lemon juice, followed by most of the powdered sugar. Start mixer on low, then increase speed to medium. Add additional powdered sugar to reach desired consistency. If the frosting is too thick, beat in whipping cream as needed.
11 -
For a rectangular cake, frost cooled cake and optionally garnish with blueberries and lemon slices. For a layer cake, ensure layers are completely cooled. Level if domed, then assemble with 180 ml frosting between each layer. Apply a thin crumb coat of frosting to the sides and chill for 20-30 minutes, then finish with remaining frosting. Optionally decorate with fresh blueberries.
12 -
Cut with a thin, sharp knife for clean slices. Serve at room temperature for best flavour and texture.