Heat the milk in a heavy based pan and reduce it to 1/3rd its quantity
Add the brown sugar and crushed cardamom to the boiling milk and stir well.Cook for another 5 minutes and cool down(it should be Luke warm which means, if you dip your finger in the milk, your finger should feel comfortably warm but not hot)
now add 3 tablespoons curd to warm milk mixture and mix very well and make sure curd dissolves in the milk.
Transfer the mixture to earthen pot, terracotta bowls or earthen handi.Andcover with a lid or seal with aluminium foil.Keep in a warm place for the meetha dahi to set.
It may take to 24 hours to set according to the weather in your city.Once set, refrigerat and serve chilled.