Drop 1 or 2 longan fruits into each paper cup. Add 3 tablespoons (1.5 oz. or 45 g) of longan syrup. Place all the paper cups on a tray to keep them level and freeze for at least 2-3 hours.
Remove from the freezer and add 3 tablespoons of mango juice to each paper cup. Cover the top of each cup with a 4"x4" (10 cm x 10 cm) square of aluminum foil, and cut a small slit in the center just wide enough for the ice cream stick. Insert the ice cream stick into the slit. Transfer the cups back to the tray and return to the freezer for another 2-3 hours.
When the second layer is frozen, remove the foil and add 3 tablespoons of pomegranate juice to each cup. Freeze for another 2-3 hours without the aluminum foil.
When ready to serve, remove the paper cups from the freezer. Use your palm to warm the sides of the cups, then gently slide the popsicles out by holding the ice cream stick. Serve immediately.
Notes
You can substitute with your choice of fruit juices.