Boil 2 cups of water. Mix rice flour with salt and butter and then add enough boiling water to make a soft dough similar to idiappam dough. Heat Jaggery and coconut in a pan and to mix them well. Take small balls(lemon size) from the dough and spread it on banana leaf and keep a tablespoon full of jackfruit-coconut mix in the center and fold and press the edges to seal. Steam the ada's in a vegatable steamer or idli cooker. Serve ho