Step 1: Prepare the Batter
Preheat your oven to 160°C (320°F). Prepare a roasting dish with parchment paper.
In a large bowl, beat the egg whites until stiff peaks form. Gradually add sugar while beating on medium speed for 30 minutes until the mixture is glossy and smooth.
Fold in almonds and pecan nuts.
Fold in the mixed peel.
Fold in the spices.
Fold in the flour and mix gently until fully combined.
Step 2: Bake the Pfefferkuchen
Pour the batter into your prepared roasting dish, spreading it evenly to about 1 inch thickness.
Bake for 20–25 minutes, checking with a cake tester. The cake is done when the tester comes out clean.
Step 3: Make the Icing
While the cake is baking, mix icing sugar with 3 tablespoons of water, adding extra drops slowly until thin and pourable.
Step 4: Finish with a Simple Icing
Pour the icing over the top, spreading thinly.
Allow the icing to set for 15–20 minutes before slicing into small squares or rectangles.