Put all ingredients into a saucepan and bring to the boil. Once the sugar is all dissolved turn down the heat.
Leave to boil softly until all craberries have popped open. Take of the fire and remove the cinnamon and star anise. Put in a blender and puree until smooth. Be careful when turning on the blender as it is hot which means it will spatter too. You can also use a stick blender.
Notes
Notes on cranberry sauce
You can keep the cranberry sauce in an airtight container in the fridge for 1-2 weeks.
Don't use dried cranberries for making the cranberry sauce as that will not be a good result
You can use frozen cranberries as the result will be the same as with fresh cranberries