Beat the butter and the sugar until creamy, stir in the egg. Combine all dry ingredients and half the grated chocolate and stir everything in the mixing bowl into a nice dough. Grease a baking tray or line it with baking paper. With clean hands, roll the dough into balls the size of a walnut and arrange on the baking tray, not too close to each other.
Leave to fully cool.
Melt the remaining chocolate over a bain-marie. Leave to slightly cool and pour into a piping bag. Pipe thin trickles of chocolate onto the biscuits. If you don’t own a piping bag, you can use a spoon. Leave to dry again and serve!
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