Take a bowl, a sieve and a muslin cloth.
Add curd in it, cover and let it set in fridge for 2 hours to make hung curd.
In a bowl add hung curd and whip it well.
Add condensed milk and mix it thoroughly.
Add saffron strings soaked in milk and mix again and keep it aside.
Grease bowl with ghee and fill with hung curd till half or 2/3.
Pat a little to even out. Garnish with chopped nuts, cover with foil.
Take a large pan add water in it and place a stand in the center.
Add a flat strainer on the stand.
Once water is hot add the bowl on it.
Cover and cook for 20-25 minutes on medium flame.
After 25 minutes, turn off the heat,remove the cover and let it cool completely.
Once at room temperature, remove the foil and refrigerate it for 3-4 hours.
After 4 hours, demold it, garnish it and serve cold.