Beat 1 egg white until stiff. Add sugar and continue beating for 6-8 minutes. Mix almonds, cinnamon and cocoa. Fold into the egg white mixture and work into a smooth dough. Pour the dough onto a piece of baking paper sprinkled with flour. Cover with cling film and roll out the dough to a thickness of approx. 5 mm. Cut out hearts (approx. 5.5 cm Ø) from the dough and place them on 2 baking trays lined with baking paper.
Beat the remaining egg white until stiff for the icing. Add icing sugar and stir in. Brush the hearts with the icing and place 1 almond on each. Bake in the preheated oven (electric: 150 °C/ gas: level 1) for 15-20 minutes on the lowest rack. After 5 minutes baking time cover if necessary and continue baking. Let cool off