Step 1. Transfer 1 cup cranberries to a small saucepan with 1 ½ cups water. Bring the liquid to a boil before reducing the heat to low. Simmer uncovered for about 10 minutes, or until the water is half evaporated and the cranberries soften and start to break apart. Roughly mash the cranberries into a loose purée.
Step 2. Add the fresh orange juice and ginger to the liquid and mix well to combine. Set aside for at least 7 minutes, stirring frequently.
Step 3. Strain the liquid using a tea strainer or a fine mesh strainer to remove the cranberries, pulp and ginger. Add sweetener to taste.
Step 4. Place about 3 cranberries, 2 small branches of fresh rosemary, and 2 pieces orange rind into each cube of a large ice cube tray. Pour the cranberry-orange-ginger juice into each cube until mostly full. Freeze overnight before using.
Step 5. For serving: Add one to two cubes to each glass for serving. Fill each glass halfway with vodka or gin for an alcoholic beverage, or ginger ale or sparkling water for a mocktail.
Make Immunity-Boosting Cranberry Ginger Tea: Or add hot water to make cranberry-ginger tea. Take it to work and sip throughout day to help boost immunity.