Take a large bowl and add rice flour and salt as required.
Add warm water little by little to make a smooth dough. Keep it aside.
Take a saucepan, add grated coconut, jaggery, cardamom(crushed) and 1/2 cup water.
Cook till the jaggery melts and water is absorbed. It may take 5-6 minutes. Then turn off the flame.
Roll the rice in step 1 into a ball and flatten it onto the centre of a square piece of banana leaf. Place two tablespoons of the coconut-jaggery mix onto the flattened rice mixture and fold the leaf and seal the edges.