Ingredients

• 2 1/4 cups cake flour 
  
• 2 1/2 teaspoons baking powder
  
• 1/2 teaspoon salt
  
• 8 ounces strawberries, hulled and coarsely chopped
  
• 4 large egg whites
  
• 1/3 cup milk
  
• 1/2 teaspoon pure vanilla extract
  
• 1 1/2 sticks unsalted butter, at room temperature
  
• 1 1/2 cups granulated sugar
  
• 1 stick plus 1 tablespoon unsalted butter, softened
  
• 3 cups confectioners’ sugar, sifted
  
• 1/2 teaspoon kosher salt
  
• 3 tablespoons milk
  
• 3/4 teaspoon pure vanilla extract
  
• 12 ounces fresh strawberries, hulled and sliced