I made this cake in aprx 1 hour - not including baking time (I have never done anything this quick before). I wanted to make a little surprise for Mum. I had seen how to make the big lump of coral and wanted to try it out. You simply pour melted white chocolate (or candy melts) over ice that has been crushed in the food processor, then dump more ice on top. Leave in fridge 5 minutes and pull out. If you don't like the finished shape, you just melt more chocolate and add lump with more melted chocolate.