Take 1/4 cup rice and rinse thoroughly until you see clear water
Now soak rice into 1 cup water for 30minutes
When it is about 30 minutes, put a pan on medium heat and add 2 cups milk to it.
Now drain all the water from rice using strainer.
Grind to a semi-fine paste. If needed add 1-2 teapoons of water.
When the milk comes to a boil. Then lower the heat and add grounded rice and 4 tablespoons of sugar to it. Adjust sweetness according to taste.
Keep stirring continously otherwise rice will start sticking to bottom or start creating lumps
Cook it for 5-7 minutes or till rice is cooked
Turn off the heat and add 1 cup mango puree to it
Add 1/8 teaspoon cardamom powder. This step is optional.
Now transfer firni mixture to serving bowls, pat the bowl on the surface to remove air bubbles and set aside
When the mixture comes to room temperature, cover the bowls with cling wrap and put it in the refrigerator for 4-6 hours or overnight
Garnish phirni with pistachio silvered, mango chunks and serve cold