Preheat the oven to 180°c/160°c Fan/350°F/Gas 4. Lightly grease the baking trays.
Add the margarine and sugar to a bowl and beat together,then mix in the flour and cocoa. Bring the mixture together with your hands to form a dough. Form the dough into balls about the size of a walnut and place them well apart on the baking trays. Dip a fork in water and use this to flatten the biscuits.
Bake for 20 minutes. Lift off the baking trays and leave to cool completely on a wire rack.
Place some baking paper underneath the wire rack. Melt the chocolate in a microwave for about 40 seconds in a bowl. Dip each biscuit in the bowl, using a spoon if necessary to coat the top. Leave on the wire rack to set.
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