INGREDIENTS
2 1/4
cake flour
1 tbsp
baking powder
1/2 tsp
kosher or sea salt
1 1/4 cups
buttermilk
4
large egg whites
1 1/2 cups
granulated sugar
1 tbsp
lemon zest
1 stick
(4 oz/113g) unsalted butter, room temperature
1/2 tsp
vanilla extract
1/2 tsp
lemon extract
6 oz
fresh blueberries
1 tbsp
granulated sugar
4
large egg whites
1 1/4 cups
granulated sugar
3 sticks
(12oz/340g) unsalted butter, at room temperature