- eel the skin of the sweet potatoes, quartered them and steam until soften 
- Mash sweet potatoes while still hot 
- Into a mixer bowl, pour orange juice and milk 
- Add in mashed sweet potatoes, mix until well combine 
- Pour mixture into ice cream bowl and freeze for 2 hours 
- Meanwhile, soak sultanas in hot boiling water 
- Take out ice cream from freezer, pour it into a blender and turn on blender on high until ice cream smooth again. 
- Back into the bowl and freeze for another 2 hours. 
- Take out ice cream from freezer, scoop it into blender, and pour sultana mixture into the blender as well. Mix in high speed. 
- Pour back into the bowl and freeze. Repeat this blending step and freeze, for twice more.