INGREDIENTS
5
egg whites, room temperature
3/4 cup
buttermilk
2
lemons, zested
3/4 cup
unsalted butter, softened
1 3/4 cups
granulated sugar
2 1/2 cups
cake flour
1 tbsp
baking powder
1/2 tsp
kosher salt
1 cup
unsalted butter, softened
4 cups
powdered sugar
1
lemon, zested and juiced
2 tbsp
heavy cream