Note : If you don't use the Chakkavaratti or jackfruit jam) please increase the jaggery used from 1/2 cup to 3/4 cup.
Soak the rice in water for about 4 hours, drain the water and then grind to a smooth paste using enough water to have a somewhat thick batter (like for pancakes). Add the salt and keep aside.
Put all the ingredients in a pan on the stove, adding a couple of tbsps of water. Over medium heat, keep stirring the mixture for about 2 minutes, till the jaggery has dissolved and the mixture is moist and comes together. Take off the heat and allow to cool.
If you are not using the Jackfruit jam, use 3/4 cup of powdered jaggery and proceed with the recipe. You may need to use less if the jaggery you're using is on the sweeter side.
If you are using banana leaves, cut the large leaves into roughly 6" by 6" pieces. Then place each piece over the flame of your gas stove (a few seconds) so that the leaf just wilts. This will make the banana leaf flexible enough to fold without tearing.
Then proceed as for the turmeric leaves. After folding once, you may fold the open ends and the sides to form a sealed packet, which cannot be done with the turmeric leaves.