01 -
Preheat oven to 175°C. Grease and flour two 23-centimetre round cake pans.
02 -
Blend fresh strawberries until completely smooth to yield approximately 600 millilitres purée, set aside.
03 -
In a medium bowl, whisk together flour, baking soda, baking powder, and salt. Set aside.
04 -
In a large bowl, beat butter and granulated sugar with a mixer on medium speed until light and fluffy, about 3 to 4 minutes.
05 -
Beat in eggs one at a time. Stir in sour cream and vanilla extract until thoroughly combined.
06 -
Gradually mix in dry ingredients, alternating with milk, beginning and ending with the dry mixture. Mix just until combined.
07 -
Gently fold in 360 millilitres of the prepared strawberry purée until evenly distributed.
08 -
Divide batter evenly between prepared pans. Bake for 30 minutes, or until a toothpick inserted into the centre comes out clean.
09 -
Let cakes cool in pans for 10 minutes, then transfer to a wire rack to cool completely.
10 -
In a large bowl, beat butter until creamy. Gradually add sifted powdered sugar, alternating with additions of strawberry purée. Beat in vanilla extract and a pinch of salt. Adjust consistency with more sugar or purée as needed.
11 -
Level cake layers if necessary. Spread a layer of strawberry buttercream over the first layer. Place second layer on top and coat the top and sides evenly with remaining buttercream.
12 -
Garnish with fresh strawberries if desired. Slice and serve chilled or at room temperature.