Chop the chocolate into small pieces and place into a mixing bowl.
Add the double cream into a saucepan and add the butter. Bring it almost to the boil.
Pour the hot cream into the chocolate and mix it well until you have a thick glossy ganache.
Pour the chocolate mixture into a flat dish and place it into the fridge for an hour.
Roll out the truffles (making sure you have cold hands helps) and coat them in your chosen toppings.
Refrigerate the truffles until you’re ready to eat them.