Firstly, soak basmati rice for 1hrs.Discard the water and blend rice to coarse paste. keep aside.
Now, in a large bowl boil milk.stir occasionally, and simmer for 10 minutes.keep the flame on low or till milk thickens.now add in prepared coarse rice paste.stir continuously for 5 minutes. else, lumps might form.Simmer for another 5 minutes stirring in between boil the milk till the rice gets cooked completely. Add some nuts.
Further add sugar mix well till the milk thickens and turn creamy.
If looking to prepare mango phirni, allow the phirni to cool completely.now add mango pulp and mix well. add more pulp depending on the sweetness.
Finally, serve chilled mango phirni garnished with few chopped nuts and chopped mango.