Luffa are best eaten when small (less than 12 cm) and still green.
In Karnataka's Western Ghats, it is known as tuppadahirekayi which means buttersquash. It grows naturally in this region and consumed when it is very tender and green. It can be used in curries, bhajji, When it is dries out, it is used as a natural scrubber and washing sponge.
In Andhra, it is called Adavi beera means ridge gourd. In Kerala, it is called Peechinga. In Maharashtra it is known as dodka (ridge gourd luffa) and ghosavala (smooth luffa). It is very easy to prepare, tasty too with chana dal, or can be made as stir fried subzi too. Here I made this with peanuts. You can use fresh or dried peanuts.