RINSE: Rinse the cranberries under cold running water in a colander.
SLOW COOKER: Add cranberries, orange juice, orange zest, sugar, 2 tablespoons water, and any extra add-ins to a 3-quart slow cooker. Stir to combine. Allow the sauce to cook on high for 3-4 hours OR on low heat for 7-8 hours. The sauce will thicken significantly as it cools. Remove add-ins before storing or serving.
STOVE TOP: Add the orange juice, sugar, ½ cup water, and any add-ins to a saucepan over medium-high heat. When the sugar has dissolved, add the cranberries and orange zest. Simmer over medium heat for 10-12 minutes or until the cranberries burst. Let the sauce cool to room temperature before refrigerating. The sauce will continue to thicken significantly as it cools. Remove add-ins before storing or serving