Soak cashews, almonds, raisins, melon seeds, fennel seeds, poppy seeds, green cardamoms, black peppercorns and cinnamon stick in 1 cup water for 5-6 hours or overnight.
Strain the water and pour this mixture into a grinder jar with 2 tbsp milk.
Grind the mixture to a smooth paste.
In a liquidiser jar, add the thandai paste, milk, gulkand, saffron and sugar. Blend until sugar is dissolved.
Allow it to sit for 1-2 hours in the refrigerator and then pass this through a strainer. Pour the thandai in the glasses. Garnish with saffron and serve chilled.