In the bowl of a stand mixer, sift together flour, sugar, and baking powder and add the lemon zest. Stir to combine.
1 1/2 cups cake flour, 3/4 cup sugar, 3/4 teaspoon baking powder, Zest of 2 lemons
Add the softened butter to the flour mixture and mix on low until just combined, about 30 seconds.
15 tablespoons unsalted butter
Then slowly add in the milk mixture, beating on medium speed until batter is combined. Turn the mixer speed on high and beat for an additional 20-30 seconds.
Pour batter into prepared loaf pan and bake for 45-50 minutes, or until toothpick comes out clean when inserted in the center of the cake.
Allow cake to cool for 15 minutes then un-mold.
While cake is cooling, make the glaze. Combine powdered sugar and juice of 1 lemon, at first then slowly add the juice of the other lemon. Everyone likes their glaze consistency different so if you like it thicker, add less lemon juice, if you like it runnier, add more lemon juice.
2 cups powdered sugar, Juice of 2 lemons
Once cake is cooled, take a fork and pierce all over the top of the cake. Unmold and set on a wire rack with parchment or wax paper underneath. Pour the glaze evenly over the top and let it cool for 10-15 more minutes before slicing.