Dissolve the corn flour in little milk and keep aside.
Combine the milk and sugar in a vessel and bring to a boil.
Add the corn flour mixture and let it simmer for 4 – 5 minutes or until milk thickens.
Turn off the flame and let it cool completely.
In a bowl, add the cream, cinnamon and vanilla and combine.
Add the milk mixture and mix everything.
Transfer it to a container.
Cover and freeze till it is almost set.
Break the mixture into pieces with a knife and blend it in a mixer until smooth.
Pour back again in the same container and cover. Freeze till it is firm.
Scoop and serve.