01 -
Preheat oven to 200°C.
02 -
Remove stems from strawberries and process with a food processor until a chunky purée is achieved. Set aside.
03 -
In a large mixing bowl, cream together butter, granulated sugar, and egg using medium-high speed for 2 minutes.
04 -
Add vanilla extract, buttermilk, and strawberry purée to the bowl. Mix until evenly blended.
05 -
Add cake flour, all-purpose flour, baking soda, baking powder, and salt. Mix on low speed just until incorporated, scraping bowl sides if necessary. Do not overmix.
06 -
Spoon the batter into a piping bag or freezer bag. Place the bag in a large cup to support it and fold the edges over the rim for easier filling.
07 -
Grease donut pan thoroughly. Snip the tip from the bag and pipe batter into moulds, filling each cavity no more than halfway.
08 -
Bake on the middle rack for 7 to 8 minutes, until lightly golden and springy.
09 -
In a separate bowl, whisk together powdered sugar and enough milk to achieve a smooth, pourable glaze. Set aside.
10 -
Remove donuts from pan while hot and transfer to a wire rack. Drizzle or dip tops in the glaze and allow excess to drip off. Let the glaze set for 20 to 30 minutes before serving.