Ganache
Warm the cream and pour it over the chopped semisweet chocolate.
Mix until you get a glossy cream.
Cover the cake and let it drip over the edges.
Spiderweb Decoration
Melt the white chocolate and place it in a piping bag with a fine nozzle.
Pipe concentric circles on the ganache.
Using a toothpick, pipe alternately from the center outward and then from the outside inward to form the spiderweb.
Finishing Touches
Place shredded coconut on the sides if desired.
Decorate with Chantilly rosettes and chocolate rings on to