Melt the chocolate in a food-warming drawer at a temperature of 85 degrees. Alternatively, melt in a saucepan stirring gently until melted
Once melted, add the butter, vanilla essence and condensed milk. Mix well.
Leave the mix in the warming draw/in the heated saucepan at the same temperature, stirring 3 or 4 times occasionally. The consistency should thicken on each stirring. At this point, you could add dried fruits or chopped nuts to the mix if desired.
After 2 hours, transfer the mix into a lined Tupperware container and put it in the fridge to cool and set