This is not the kind of jam with the jelly like settingin commercially available jams, it is more of a grape preserve. Grapes contains galactose one of the healthiest of sugars and usage of black grapes and currants makes it an iron packed jam.
grape juice 250 ml without sugar
1tsp jaggery optional
100gms black currant/sultanas/munakka
Mix all the ingredients and heat in a thick vessel till the juice thickens and u get a very thick consistency