Beat butter and sugar until fluffy, add flour and coco, sifted, then coffee.
Mix until you have a smooth dough.
Cover with cling film and let it rest in fridge for at least a couple of hours.
Out of the fridge dough culd be pretty hard, knead a little to soften and for balls, the size of a big walnut.
Put them on a baking tray and press gently to give them an oval shape.
Do a small superficial cut on the cookies to give the impression of a coffee bean.
Put the baking tray into the fridge for about ten minutes before putting it in the oven.
Bake at 350°F for 6-10 minutes.
Please consider they will be very soft when hot, so soft you could think they are still raw but they will be ok when cold; do not tuch them before completely cold.