Break Cherupayar(Green Gram) slightly and cook it properly in required quantity of water.
Take about 3 - 4 Tsp of cooked cheru payar, add green chilli, tamarind (if necessary add some water) and grind them properly.
Change this paste into a cooking vessel, add the remaining cooked Cherupayar, red chilli powder, turmeric powder and required quantity of salt and water and cook the mix for about ten minutes.
Add some water into the curd, stir it well and add it into the cooked cherupayar along with other ingredients, Stir it well and boil the mix for about 2 - 3minutes. Then put off the stove.
Heat oil in a cheenachatti/frying pan, burst mustard seeds, add red chilli pieces and curry leaves. Stir the mix and fry these ingredients properly.
Add these fired ingredients into the already prepared Cherupayar Thayir Koottaan.
Cherupayar Curd Curry is ready. This Koottaan can be served with cooked Rice/Dosa etc.