In a saucepan add in ¾ cup of water, to this add in ¼ cup of ragi flour. Mix well.
Such that the flour is completely dissolved, and no lumps remain. Now switch on the stove and keep cooking in a low flame.
The mix will get thick and glossy. Keep stirring continuously to avoid lumps. Once its thick and the colour changes, Switch off the flame. Allow it to cool down and then add in 1.5 cups of butter milk. Add 1 cup of water if you prefer it to be more thin.
Mix well so that the ragi and buttermilk blends completely without any lumps. Next add in the required Salt.
Mix well and set aside. Heat a pan with oil once its hot add in the Mustard seeds let it splutter.
Next add in the cumin seeds and hing/ Asafoetida. Pour the tadka over the prepared butter milk and mix well. Garnish with few curry leaves and serve.
Video
Notes
You can use ginger and green chillies in the tadka for flavour.