INGREDIENTS
2 3/4 cups
all-purpose flour
3/4 tsp
baking soda
1/2 tsp
cream of tartar
1/2 tsp
salt
1 1/2 cups
granulated sugar
3 tbsp
fresh lemon zest (from about 5 large lemons)
1 cup
unsalted butter, softened but slightly firm
1
large egg
1
large egg yolk
1 tsp
vanilla extract
1/2 cup
unsalted butter, softened
3 cups
powdered sugar
2 tbsp
fresh lemon juice
1 tbsp
heavy cream (, or as needed)