To prepare the filling, mix 200 grams of grated coconut and 100 grams of jaggery in a pan. Cook on a medium flame until the mixture thickens. Set aside to cool.
For the dough, boil 1 cup of water with a pinch of salt and 1 teaspoon of oil. Once boiling, turn off the flame and add 1 cup of rice flour gradually, stirring continuously to avoid lumps.
Transfer the dough to a plate and knead well once it's warm enough to handle.
Make small balls from the dough, flatten them to form a small cup, and place a portion of the filling inside.
Fold and seal the edges to form a dumpling.
Prepare a steamer by boiling water. Place the dumplings on a greased steamer plate and steam for about 10-15 minutes.
Serve the Kozhukattai warm.