01 - Rinse the cranberries, removing any stems or damaged berries.
02 - In a medium saucepan, combine water and sugar; bring to a boil over medium heat, stirring until sugar dissolves.
03 - Add cranberries and salt, along with orange zest if using; return to a boil, then reduce heat to a simmer.
04 - Cook uncovered for 10 to 12 minutes, stirring occasionally, until most berries burst and mixture thickens.
05 - For a smooth texture, blend the hot sauce using a blender or immersion blender until completely smooth.
06 - Transfer sauce into a lightly oiled 15 oz can or loaf mold to achieve the classic shape.
07 - Allow to cool to room temperature, then refrigerate for at least 4 hours until fully set.
08 - To unmold, run a thin knife around the edges, invert onto a plate, slice, and serve chilled.