Mix the biscuits into a powder, add rum, milk, cocoa and a tablespoon of powdered sugar. Mix and roll the smooth mass into a sheet about 0.5 inch thick.
Beat the butter with powdered sugar, add the coconut and then spread this mixture on the cookie sheet. Put it in the fridge to harden.
After it has harden, cut into small squares and decorate the top with chocolate glaze.
