Wash radish and soak in salt water for 1 hour. Clean and grate it using a grater. Chop onions into fine pieces. Heat butter in a frying pan and tamper with cumin seeds. Add grated radish and onions and fry in a high flame stirring constantly till raw smell goes. Mix other powder ingredients and fry for another one minute. Remove from fire and mix finely cut raw onions and coriander leaves to that. Use 1 tbsp of filling for each paratha.