First of all wash proprly bathuya n blanch for 5 min.. Now remove the excess water n keep it for cool..Tk a big bowl n mix curd wid d help of whisk...Now tk a mixi jar n make a thick paste of bathuya n green chillies...now add d paste in curd...Add both salt,rd chilli pwdr,roasted cumin pwdr n mix it well...Now tk a tadka pan,heat musturd oil n put blck musturd seeds in d oil...when musturd starts crackling remove d tadka pan frm gas n pour it in curd n mix prprly n serve...