@Mew, the mesocarp (light orange outer layer part under the spikey skin) are discarded. The red flesh insides called the arils & the seeds' membranes/sacs are consumed. The arils coat the seeds & have very little taste, slightly sweet or not sweet. Although they may not taste delicious but they are good sources of antioxidants & beta carotene.
For Xoi Gac, the arils give it the rich reddish orange color when cooked with glutinous rice. Since the arils have little taste & sweetness, salt, sugar & coconut milk are added when making Xoi Gac.
I don't think I have ever eaten Xoi Gac made from fresh Gac fruit before in all my life lol
, probably twice from frozen Gac fruit :cry:
. But for those 2 times, the sweet & fragrant flavors were wonderful :drool:. The best parts of this dessert are that you could eat it with Gio Lua (Vietnamese Ham), sweet, fragrant & savory flavors all in one bite and chew the seeds to eat their membranes
.
More info on Gac fruit:
http://www.foxnews.com/health/2011/02/22/gac-strange-powerful-fruit.html