01 - In a medium saucepan, combine cranberries, sugar, and water or orange juice.
02 - Bring mixture to a boil over medium-high heat, stirring occasionally.
03 - Reduce heat to medium-low and simmer for 10 to 12 minutes until cranberries burst and sauce thickens.
04 - If using, add orange zest and cinnamon stick during the last 5 minutes of cooking.
05 - Remove from heat, discard cinnamon stick if used, and let sauce cool to room temperature to thicken further.
06 - Transfer sauce to a serving bowl and refrigerate until ready to serve.