
¾ cup milk (at room temperature)
1 tablespoon vinegar
½ cup salted butter, room temperature (1 stick)
1 cup granulated sugar
2 eggs
1 tablespoon vanilla
1 cup cake flour
½ teaspoon baking powder
½ teaspoon baking soda
½ teaspoon salt
2 lemons (2 teaspoons zest and 4 tablespoons juice)
4 sticks unsalted butter, room temperature
¼ teaspoon salt
3¾ cups powdered sugar
3 tablespoons freshly squeezed lemon juice
½ teaspoon pure lemon extract
1 teaspoon vanilla extract