Hold the cactus fruit with a pair of tongs and use a knife to scrape away the spines. Peel the skin off with the knife.
Rinse each fruit and shake off the excess water.
Place the fruit in a freezer bag and seal the bag.
Place the bag in your freezer for two to three days.
Place a colander on top of a bowl and place the prickly pear fruit inside the colander. Allow the fruit to thaw.
Press the fruit gently with a potato masher so that the juice flows into the bowl.
Drink your prickly pear juice right away, or pour it into ice cube trays and refreeze the fruit. Use frozen prickly pear ice cubes in your cold beverages.