Wash and soak rice for 2 hours.
Rinse soaked rice again and put it in a mixer jar. Add coconut, salt and green chillies. Add little water and blend to smooth paste.
Once batter is ready, cut cucumber into half vertically. Scoop out all the seeds and grate it using grater.
Now combine, cucmber, cumin seeds and batter in a bowl. You can adjust the consistency of batter at this point by adding water if required.
Heat non stick pan and grease with drop of oil. When it is hot enough, pour laddle full batter on the pan and spread it in circular motion with the back of laddle or spoon. Cook it from one side and then flip to cook the other side.
Serve with ketchup/chutney/or any dip you like.