Firstly, make the blackcurrant coulis/puree. Place the blackcurrants in a pan and add a tablespoon of water. Boil for just a minute or two, until the fruit begins to breakdown and soften slightly. Take off the heat. Using a hand blender or a stick blender, whizz the blackcurrants into a puree. Then, pass the blackcurrants through a fine sieve, pushing down with the back of a metal spoon, so that you have a smooth puree. Discard anything in the sieve. Leave the coulis/puree to one side to cool.

For the ice cream, pour the can of condensed milk and double cream into a bowl. Add the vanilla extract or scrape in some vanilla seeds from the pod (by cutting it in half lengthways and using the tip of a knife to scrape them out). Use an electric hand whisk to beat the condensed milk, cream and vanilla until the mixture is quite thick for four-five minutes. It should be as thick as buttercream.

Add the finely chopped or grated white chocolate and your cooled blackcurrant coulis/puree to the creamy mixture. Stir together lightly. Pour the mixture into a freezeable container or loaf tin, cover and leave overnight. There is no need to stir the mixture at all while it is freezing. Before serving, leave it to stand for twenty minutes or so, until you can easily scoop it.