Lemon Cake

o 11/3 cups (2 sticks plus 51/3 Tbsp) butter, softened
o 11/3 cups granulated sugar
o 2 Tbsp finely grated lemon peel
o 2 tsp baking powder
o 3/4 tsp salt
o 4 large eggs, at room temperature
o 1/3 cup lemon juice
o 2 tsp vanilla extract
o 13/4 cups all-purpose flour
o Frosting
o 3/4 cup (11/2 sticks) butter, softened
o 6 Tbsp reduced-fat [...]