Cut the orange in a few chunks – don’t peel. Put the orange pieces & cranberries in a food processor and process until it’s finely chopped but not pureed. Add sugar, starting with 1/4 cup and moving up from there. Pulse to combine. Transfer to a tupperware and refrigerate for at least a few hours if not overnight. This gives the flavors time to meld. Plus then you have one less thing to do on Thanksgiving! Serve cold or room temperature.