1. Rinse and drain the fresh cranberries. Pick off any stems or any bad berries. Then place them in a large sauce pan. Pour in 1 cup of orange juice, granulated sugar, and orange zest.
2. Mix well and then cook on medium-high heat for 5 minutes until the cranberries come to a boil. (As the liquid starts to heat the cranberries will begin to make a "popping" noise. This is totally normal!) Reduce the heat to medium-low and cook for an additional 15-20 minutes, stirring often until the berries are cooked down and the liquid has thickened.
3. Once the cranberries are done cooking. Remove from the heat, mix well and let sit un-covered for 30 minutes. The sauce will naturally thicken. Enjoy immediately or transfer to an airtight container and store in the refrigerator for up to 5 days.