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.