For preparing ridge gourd green gram curry, cut the ridge gourd into small pieces.
Put the ridge gourd, turmeric powder, salt, green gram, green chilly and chilly powder in a pressure cooker. Allow it to cook for 2 whistles.
In another vessel roast the black gram in oil and grind it along with coconut and cumin. Make it into a fine paste and add it to the pressure cooked ridge gourd. Allow it to boil well.
Heat oil in a pan and splutter the mustard seeds.
Add in curry leaves and dry red chillies to it. Add it to the curry and remove it from the flame.
Ridge gourd green gram curry is ready. Serve hot with chapatti.