Roughly grate the chocolate or chop it into small pieces. Knead the butter with sugar, salt, egg and the orange peel. Sift the flour mixed with the baking powder over it, add the chocolate and knead everything quickly to form a dough. Shape the dough into a ball and wrap it in cling film and let it rest in the refrigerator for about 2 hours.
Preheat the oven to 200 ° C. Roll out the dough on a floured work surface about 0.5 cm thick and cut out round cookies about 4-5 cm in diameter. Place the cookies on a baking sheet with enough space between them and bake on the middle rack for 8-10 minutes. Then let cool on a wire rack.
Mix the powdered sugar with the orange juice and coat the cookies with the glaze, let the icing dry well.