This is called mullusauthe kadabu in Kannada.
1 cucumber grated, (roughly around 1 ½ cups)
1 cup Idli rawa
¼ cup curd
4 green chillies finely chopped(can be modified to taste.)
2 tbs grated fresh coconut
1tbs chopped coriander
Salt to taste
Mix all the ingredients and steam like normal Idli’s.