Soak Dates: In a bowl, add deseeded dates and 1 cup milk. Soak for 30 minutes.
Make Date Paste: In a blender jar, add soaked dates with milk and blend well to make a thick paste. Set aside.
Reduce Milk: In a wok, add 1 litre milk and bring it to a boil. Cook on low flame until milk reduces, about 18-20 minutes, stirring occasionally.
Combine Ingredients: Turn off the flame. Add the blended date paste and milk powder to the reduced milk and whisk well.
Cook Kulfi Mixture: Turn on the flame and cook on medium heat, stirring continuously, until the kulfi mixture thickens, about 5-6 minutes.
Add Dry Fruits and Cardamom: Add crushed green cardamom, roughly chopped almonds and cashew nuts. Mix well and cook on medium flame for 1-2 minutes.
Cool and Freeze: Let the mixture cool while stirring. Pour the kulfi mixture into matkas (earthen pots), sprinkle sliced almonds and pistachios on top, cover and seal with aluminum foil. Freeze for 10-12 hours.