Zest and juice one orange
Using a large saucepan, bring orange zest, juice and water to a boil
Add cranberries, reduce heat and simmer until berries pop open, about 10 minutes
Process berry mixture through a food mill. You can use a standard foley mill, but we prefer the food mill attachment for our Kitchen Aid mixer.
Return cranberry mixture to saucepan, and bring to a boil stirring to avoid scorching.
Add sugar and return to a boil, stirring constantly.
Process in a water bath canner for 15 minutes