Dark chocolate and cinnamon sauce

Method

• 1
  Place the water, sugar and cinnamon stick in a small saucepan over low heat. Stir until the sugar dissolves.
• 2
  Increase heat to medium and bring to the boil. Add the chocolate and use a balloon whisk to whisk until the mixture returns to the boil.
• 3
  Remove from heat. Whisk in the butter. Set aside, stirring occasionally, to cool completely. Strain the mixture through a fine sieve. Discard the cinnamon stick. Pour into an airtight glass bottle or jar.