For the pumpkin seed cake, beat the yolks with 150 g of sugar until the mixture has turned lighter in color. Add the grated pumpkin seeds and nuts.
Next, beat the egg whites to a medium-stiff snow and while continuing to stir, let the granulated sugar trickle in and mix firmly.
Gently fold the egg white mixture into the green batter and gently incorporate the apples. Stir in the crumbs moistened with rum as well. Sprinkle the flour over the top and stir in with a wooden spoon.
Line the bottom of a cake pan with parchment paper, pour in the batter and bake on the middle rack in the oven at 180 °C for about 75 minutes.
Sprinkle the cooled pumpkin seed cake with powdered sugar.