Chop the couverture and melt it in a hot water bath, except for about 4 tablespoons. In the meantime crumble the rice cakes. Roughly chop the candy canes.
Lift the liquid chocolate coating out of the water bath. Add the remaining chocolate coating and melt while stirring. Stir in rice cake crumbs and grated coconut. Pour into a mould lined with cling film (approx. 18 x 25 cm) and smooth down. Sprinkle with sugar canes and sugar pearls, press in lightly. Put in a cool place for about 1 hour to set.