Cut the arati davva and drop these pieces into thin buttermilk.
Pressure cook it for 3 whistles.
Once cooled drain excess water and let it cool for a while.
Squeeze the excess water and keep aside.
Soak pebble size tamarind and extract juice out of it.
Chop green chillis and ginger.
Heat oil in a thick bottom pan, add chana dal and urad dal.
Once the dals started changing colors, add mustard seeds, cumin seeds and red chilli.
When start spluttering add chopped ginger and green chillis.
Add curry leaves and asafoetida.
Add tamarind juice and salt and turmeric powder.
Once the juice started boiling add arati davva pieces.
Let it cook for a while or till the moisture present it evaporates.
Add rai powder but it is only optional.
Serve Arati Davva kura with hot piping rice and a spoon of ghee.