You will need a can of orange juice concentrate. If you are unable to find it at the store you can easily make your own at home by pouring fresh orange juice into an ice cube tray, then freezing. Feel free to use a different concentrate for whichever flavor frosted drink you'd like. Pineapple or lemonade would be delicious!
Taste and adjust as you go with the ice. We've provided a base for how much ice to use in your orange Julius, and have found that this is our favorite consistency. However, you can add extra ice if desired for even thicker, frostier texture.