01 - Rinse cranberries thoroughly, discarding any soft or damaged ones.
02 - In a medium saucepan, combine cranberries, granulated sugar, water, orange juice, and the cinnamon stick.
03 - Heat over medium-high, stirring occasionally until the mixture reaches a boil.
04 - Reduce heat to low and simmer for 10 to 12 minutes, allowing cranberries to burst and the sauce to thicken.
05 - Remove from heat, discard the cinnamon stick, then stir in orange zest and a pinch of salt if desired.
06 - Let the sauce cool to room temperature to thicken further, then transfer to a container and refrigerate until serving.