Combine flour, icing sugar, butter (in cubes), salt, all of the rosemary & the orange zest in a bowl & knead w/ your hands until there is a fine dough.
Divide the dough into 2 parts & wrap w/ clingfoil. Shape into cylindrical or square form w/ your hands (diameter about 3 - 4 cm).
Store the dough in your fridge for about 30 min in the fresh department (about 0° C).
Line 2 baking trays w/ baking parchment.
Preheat the oven to 160° C fan.
Cut the cold dough into slices of about 4 - 5 mm thickness. You'll get about 30 slices overall.
Place the cookies on the baking tray (5 x 3).
Bake in the preheated oven for about 12-14 min; afterwards let the cookeis cool down to room temperature.
Melt the dark chocolate in a bain-marie.
Dip each cookies in the chocolate & place on a large plate. You'll need 2 plates.
Put the plates w/ the cookies in the fridge for about 30-60 min - until the chocolate is no longer soft.