Luffa to me, is one kind of vegetables only. I noticed that wiki says it’s fruit.
Luffa can be cooked as vegetable when it’s young. You can stir fry, or cook it in soup, any way you like. If you let it grow too old, the center part can be used as sponge for cleaning purposes after it gets dry.
There are 2 popular kinds of luffa, one has smooth skin, the other kind looks like giant okra.
One thing you need to know is, if you let chopped luffa stays in air too long, it will change to darker color. Sometimes even after you cook it. So luffa means eat when fresh.
There is a saying that if you cook luffa in boiling water along with some white vinegar first, then luffa won’t change color.
For more info., please click on wiki link:
For dishes using luffa, please click on following links: