for lemon vanilla cake
2 1/4 cups cake flour
1 tablespoon baking powder
1/2 teaspoon salt
1 1/4 cup buttermilk, at room temperature
4 large egg whites, at room temperature
1 1/2 cups granulated sugar
2 teaspoons fresh grated lemon zest
4 ounces (1/2 cup) or 1 stick) unsalted butter, at room temperature
1/2 teaspoon lemon extract
1 teaspoon vanilla extract
for filling and whipped crem butter cream filling and frosting
3/4 cup raspberry preserves
1 1/2 cups sweetened shredded coconut
1 cup room temperature salted butter
4 cups confectioner's sugar
3 tablespoon milk or cream
1/2 teaspoon lemon extract
1/2 teaspoon grated fresh lemon zest
1 teaspoon vanilla extract
2 cups cold heavy whipping cream