Preheat oven to 375 degrees F and coat a madeleine pan with butter then sprinkle each section with flour. Set aside.
In a medium bowl, sift together flour, baking powder and salt.
Using a stand or electric mixer, beat eggs and sugar until creamy. Add lemon juice and lemon zest and continue mixing.
Melt your stick of butter and slowly mix into your wet ingredients until thoroughly combined.
Fold in dry ingredients and allow for the batter to rest for about 30 minutes (I suggest putting a cloth on top).
Fill the molds of your madeleine pan about ¾ of the way and tap to ensure no air bubbles form. Bake for about 8 to 10 minutes or until edges become golden brown. Sprinkle with confectioners’ sugar before serving.