INGREDIENTS
1/2 cup
plus 3 tablespoons/150 grams butter
1
superfine sugar
1 tsp
lemon zest
1 tsp
vanilla extract
3 larges
eggs
1 2/3 cups
bob's mill baking flour
1 1/4 tsp
baking powder
1/8 tsp
kosher salt
2 cups
blueberries
2/3 cup
confectioners' sugar
1 tbsp
lemon juice