There are a couple of main ways to make a slush drink. The easiest (like in this recipe!) is to combine juice, syrup and ice and blend it in the blender. Another way is to pre-freeze your juice and blend it with water or other liquids. A third way is to make it granita-style, where you freeze a tray of mixed liquid and scrape it up with a fork every 15 minutes until it gets to the texture you like.