This very cool ice-cream cake comes with a warning: once you make it, you’re going to want it again and again and again! It’s lots of fun to make and a perfect one for kids to have a go at. As it serves quite a few people, it’s perfect for birthday parties and family gatherings. When you melt the chocolate, be careful to do so over a low heat so that it doesn’t go grainy. The caramel can also be made using a tin of condensed milk, boiled for 2 hours in water at a steady simmer – make sure the water is continuously at least 2.5cm (1in) above the top of the unopened tin. Allow to cool before using.