Combine the cranberries, blueberries and raspberries in a medium saucepan. Add in the sugar, sherry, water, orange zest, orange juice and cinnamon; stir to combine, then bring to a boil over medium high heat.
Reduce heat to simmer (low) and continue to cook until the berries begin to burst and break-down and the sauce begins to thicken. Let cool, then keep refrigerated until ready to serve.
Notes
This recipe may be prepared a couple of days ahead of serving time.