Place the cookies in a food bag and crush them using a rolling pin. Then in a double boiler, melt the dark chocolate.
Add the eggs or the milk, depending 0n your preferences. Mix well until you get a smooth homogeneous cream.
Now add the chocolate and the Rum (optional). Mix until the mixture becomes perfectly homogeneous.
Then roll it in the baking paper and close to form a large cylindrical candy.
Place the mixture on a baking sheet and, using your hands, shape it into a log.