In a heavy bottomed pan add milk, boil it on medium flame.
Once the first boil comes, lower the flame, and cook for another 5 mins.
In a bowl add about ½ Cup water. Add custard powder or cornstarch to it and dissolve.
Make sure no lumps form. Also, take only cold milk. If you dissolve custard powder in hot milk it may form lumps.
Add cardamom powder and custard milk mix to milk and cook till the milk starts to thicken.
Add sugar and dissolve it.
Cook for another 2-3 mins. then take off the flame.
Cover it with lid or a cellophane.Cool it at room temperature then refrigerate.
Add Basil seeds to water. mix and let it stand till further use. You can refrigerate these too.