In a medium saucepot add in cranberries, honey, and orange juice. Simmer on medium high heat and take it to a boil.
Reduce the heat to low, cover partially with a lid and simmer for 5 minutes. Ideally you should cook cranberries just until they ''pop''.
Stir in the cinnamon and mandarin oranges. Cook for another 5 minutes until the sauce has thickened but not very thick as it will continue to thicken once cooled.
Although it is totally personal preference. Once you’ll be reheating the sauce, you can always addmore water or juice to thin it out.
Remove from the stovetop. Let the sauce cool before transferring it into jars.