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