Preheat oven to 350F (177C). Grease a loaf pan with butter or line parchment paper.
In the medium mixing bowl combine the flour, baking powder and pinch of salt. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment (you can also use hand electric mixer), cream the butter at medium- high speed.
Add sifted powdered sugar and cream again until fluffy. Scape the sides of the bowl as needed.
With the mixer on low add egg yolks, one at the time and lemon zest. Then beat until all combines.
Sift dry ingredients into egg yoks mixture and beat until just incorporated.
Scrape the batter into prepared loaf pan.
Bake for 40- 45 minutes or until the cake is golden brown and toothpick comes out clean.
Let the cake cool for 10-15 minutes in the pan.
Stir together sifted powdered sugar and lemon juice to make lemon glaze.
Carefully invert the loaf pan and transfer the cake to a cooling rack.
Pour lemon glaze over cake and let dry.