If you are using frozen cranberries, allow them to thaw slightly on the counter. We thawed ours for about 10 minutes while we were preparing everything else.
Slice the egg root ends off the orange. Leave the rest of the. skin on. Then slice it into 8 slices.
Place the cranberries, sugar, and the sliced orange in a food processor.
Process until smooth or until no large chunks remain.
Refrigerate until ready to serve. We like the flavors to combine in the fridge for at least an hour.
Stir right before serving.
Notes
You can decrease the sugar to 1/2 cup if you want a slightly less sweet relish.
It will last up to 1 week in the fridge in a covered container.