wash ridge gourd and remove the skin from the top of the vegetable.
cut in to thin slices. keep it aside.
now mix the sliced ridge gourd to the batter.
take a dosa and heat it in a medium to low heat.
pour a ladleful of batter onto the tava. you can also, dip each ridge gourd slice in the batter and arrange them like dosa.
sprinkle a tea spoon of oil and cover the dosa and cook for 1 to 2 minutes. ( till its brown).
turn the other side of dosa and cook for 1 minute and remove from the pan.
your ridge gourd dosa is ready. serve it with coconut chutney or have it as it is.