How to make it:
Preheat oven to 180 degrees hot air. Stir marzipan, powdered sugar and yolks until smooth.
Stir room-warm butter into the yolk mixture.
Beat 4 egg whites with granulated sugar until stiff. Stir flour, lemon zest, baking powder and milk into the yolk mixture. Fold in the beaten egg whites.
Spread the mixture on a baking tray and cover with halved apricots. The mixture is enough for about 2/3 of a baking tray.
Bake for 30 - 40 minutes. After 20 minutes, turn down to 160 degrees.