Wash and peel the mangoes and grate it with the help of grater. Soak pulp in sufficient water with a piece of alum for 1 hour.
After 1 hour put mango pulp in a sieve and wash under running water till all sourness gone.
Boil milk in a kadhai. Cook till milk reduce half of the quantity. Add mango pulp, khoya, Suger, saffron and cardamon powder. Cook till 10-15 minutes on low flame. Add some chopped almonds and pistachios. Off the flame.
When the kheer cool down completely keep it in a fridge.
Serve chilled garnish with some chopped almonds and pistachios.