# Add the water and sugar to a medium saucepan, place on a low heat until the sugar has dissolved.
# Now carefully add the cranberries into the pan, and continue to cook until the berries have popped (this should take about 5 minutes).
# Then continue to cook the mixture, stirring occasionally, for a further 10-15 minutes until the mixture thickens.
# Take the pan off the heat and stir in the port.
# Pour the sauce into sterilises jars.
# The alcohol in this sauce helps preserve the fruit, meaning it can be stored for up to a year in the cupboard - perfect for turkey sandwiches all the year round!