Measure out the milk powder and keep ready.
Grind walnuts & almonds into a smooth powder. Add this to the milk powder and ground cardamom; mix well and set aside.
Grease a 8″ square pan or a plate and keep ready.
Combine water and sugar in a heavy bottomed sauce pan. Once the sugar dissolves and the mixture comes to a boil, lower the heat and simmer for 2~4 minutes. Syrup should not thicken too much, it should still be able to flow freely from the spoon.
Remove the pan from the stove, immediately stir in the milk powder mixture and rose water. Mix well to combine all the ingredients.
Pour the mixture into the prepared plate and set aside to cool for at least 1 hour. The mixture will thicken and can be cut into squares or diamonds. Store into a airtight container for up to a week.