"Ube"-a Filipino purple /lavender colored yam in a frozen grated form. You can buy this in the frozen section of a Vietnamese/ Filipino/ Thai/ possibly Indonesian grocer.
Steam the grated purple yam for 15 minutes.
Gently simmer milk and sugar. Switch of the flame once the sugar dissolves.
Now mash the purple yam with a fork.
In a container - ass both purple yam and milk with sugar
Blitz till smooth.
Add the thickened cream and cream
To make a smooth ice cream - strain the mixture and remove all lumps.
Place the mixture in your ice cream machine. Follow the manufacturer's instruction.
Allow the ice cream to set in the freezer for at least 4 hours. If you do not have an ice cream machine, place it in a Popsicle mold or serve it as a granita by scraping the ice cream with a fork.