Grind walnuts into a coarse powder and keep it aside.
Combine milk, sugar and saffron in a vessel and let the sugar dissolves completely. Bring it a boil and remove from the flame.
cover the milk and keep it aside until use.
Heat 3 tablespoons of ghee in a pan. Add the ground walnuts to it.
Keep stirring and roast over a low flame for about 7-8 minutes or until golden brown.
When it is roasted, pour prepared hot saffron milk and combine together well.
Mix very well for 2 minutes.
Add remaining 1 tablespoon of ghee to it.
Keep stirring and cook for 3-4 minutes or till it leaves the sides of the pan.
Remove from the pan and let it cool down a bit.
This halwa will thicken as it cools.
Transfer it a plate or tray and level it.
Decorate with silver warq and cut into pieces.