01 -
Puree 198g blueberries. In a saucepan, cook the puree with 60ml water over medium heat until reduced to 181g (¾ cup). Cool completely before using. This can be prepared in advance and refrigerated.
02 -
Preheat the oven to 175°C (350°F). Grease and flour three 20cm (8-inch) round cake pans, each 5cm (2-inch) deep.
03 -
In a medium bowl, whisk together 342g cake flour, 8g baking powder, 3g baking soda, and 3g salt for 30 seconds. Set aside.
04 -
In another bowl, mix 227g sour cream, 181g blueberry puree, and 54g vegetable oil using a fork. Set aside.
05 -
In a mixer, beat 170g softened butter until smooth. Gradually add 400g sugar and mix on medium speed for 3–5 minutes until light and fluffy.
06 -
Add eggs one at a time, mixing well after each addition until the yolk disappears.
07 -
Add the dry mixture and wet mixture alternately to the butter mixture, beginning and ending with the dry mixture (3 additions of dry and 2 additions of wet). Mix just until smooth. Optional: Add a small amount of pink coloring gel at this stage.
08 -
Gently fold 66g whole blueberries into the batter without overmixing.
09 -
Divide the batter evenly among the prepared pans. Bake at 175°C (350°F) for 22–25 minutes, or until a toothpick inserted in the center comes out clean with a few crumbs. Cool for 5–10 minutes in the pans, then turn out onto a cooling rack.
10 -
In a mixing bowl, beat 339g softened butter until smooth. Add 226g cream cheese in pieces and blend until combined. Gradually add 863g sifted powdered sugar, followed by 57g lemon juice and lemon zest. Mix until smooth, but do not overmix. Chill for 10 minutes if the mixture becomes too soft.