01 - Rinse cranberries and discard any that are soft or bruised.
02 - Combine cranberries, water, and optional orange zest in a medium saucepan. Bring to a boil over medium-high heat.
03 - Reduce heat to medium and simmer for 10 minutes, stirring occasionally until cranberries burst and soften.
04 - Discard the orange zest strip from the mixture.
05 - Press cranberry mixture through a fine-mesh sieve or food mill into a clean bowl, extracting juice and pulp; discard solids.
06 - Return strained juice to saucepan; stir in sugar and lemon juice.
07 - Bring to a gentle boil and cook uncovered, stirring frequently for 8 to 10 minutes until slightly thickened.
08 - Pour hot jelly into a clean bowl or mold; cool to room temperature, then refrigerate at least 2 hours until set.
09 - Turn jelly onto a plate or spoon directly from the bowl to serve.