01 - In a medium saucepan, combine cranberries, mixed berries, sugar, orange juice, water, and salt.
02 - Heat over medium-high heat, stirring occasionally until it reaches a boil.
03 - Reduce heat to medium-low and simmer for 10 to 12 minutes until cranberries burst and mixture thickens.
04 - Stir in orange zest and cinnamon if using, then simmer for an additional 2 minutes.
05 - Remove saucepan from heat and allow sauce to cool; it will thicken further as it cools.
06 - Transfer sauce to a bowl or jar and refrigerate until ready to serve.