You can't do it after you get some fruit because the middle of the stem will then be very fibrous and it will be like eating sugar cane. To cook it you have to harvest before the plant flowers. More links:
Spicy dish made of wild banana trunks and beef - Nation | The Star Online
Zingiberales in Traditional Malay Cooking (with recipes)
http://www.heliconiasocietypr.org/HS...013%281%29.pdf
Recipe (in Malay)
Google Translate