First of all separate the pulp of custard apple from the seeds. You can use a sieve or do it with spoon too. Using ripe custard apple is best for this recipe.
Now boil the milk and then add milk powder and cashew paste and cook till it thick. If you want you can add a little milkmaid, I however skipped it.
Next add cardamom powder and chia seeds and soaked kesar or saffron too.
Put off the flame and let it cool a bit and then add custard apple pulp and mix well.
Now keep this in refrigerator and serve chilled. You can garnish with some nuts of choice.