In a large mixing bowl, beat the egg yolks for about 5 minutes until fluffy. Slowly mix in the sugar until all has been added and continue beating for another 2 minutes until thick and pale in color.
6 large egg yolks, 3/4 cup (150g) granulated sugar
Sift in the flour, baking powder, and salt. Mix on low speed until just combined and give a final few stirs by hand to make sure all the flour is incorporated. Pour the batter into the prepared pan.