INGREDIENTS
2 1/4 cups
cake flour
1 tbsp
baking powder
1/2 tsp
salt
1 1/4 cups
buttermilk
4
large egg whites
1 1/2 cups
sugar
2 tsp
grated lemon zest
1 stick
unsalted butter, softened
12 oz
fresh raspberries, divided
1 tbsp
water
3 tbsp
white sugar
1 tbsp
cornstarch
1/4 cup
water
2 cups
white chocolate chips
1 cup
unsalted butter
5 cups
confectioners' sugar
2 tbsp
milk, or as needed