Blend fresh strawberries into a smooth puree. Cook over low heat until reduced to ½ cup. Cool completely
Preheat oven to 350 degrees Fahrenheit. Grease and line a cake pan
In a bowl, whisk together cake flour, baking powder, baking soda, and salt
In a separate bowl, beat butter and sugar until light and fluffy
Add egg whites one at a time, mixing well after each addition
Mix in sour cream and almond extract until smooth
Add dry ingredients in parts, alternating with milk. Mix gently until just combined
Fold in the cooled strawberry puree evenly into the batter
Pour batter into prepared pan and smooth the top
Bake for 30 to 35 minutes or until a toothpick inserted in the center comes out clean
Cool in pan for 10 minutes, then transfer to a wire rack to cool completely before slicing