Sift the flour, cocoa and powdered sugar. Mix with instant coffee powder, chocolate shavings and diced butter. Knead and form 3 rolls with a diameter of approx. 2 - 3 cm. Chill for 20 minutes.
Preheat the oven to 160 ° C. Cut the rolls into 5 mm thick pieces, place on a baking sheet lined with baking paper, bake for about 12 minutes. Carefully place the cookies on a wire rack to cool.