Translation taken from here.
Credit goes to Ogawaa.

Aren't those things poisonous?

Gigginox is poisonous; Khezu's just foul.

No way in hell am I eating a Khezu.

ialdabaoth said:

No way in hell am I eating a Khezu.

They're surprisingly good eating. Fatty, like salmon or tuna belly.

CrazyYanmega said:

They're surprisingly good eating. Fatty, like salmon or tuna belly.

Wasn't there's in-game line descripting Khezu meat as 'looks appetizing, but inedible'?

Rathurue said:

Wasn't there's in-game line descripting Khezu meat as 'looks appetizing, but inedible'?

That's the flank. The lips are tasty though.

Rathurue said in comment #1820080:

Wasn't there's in-game line descripting Khezu meat as 'looks appetizing, but inedible'?

I believe in an old interview a dev also said that Khezu had barely any meat on them, and were mostly just fatty tissue. Take this with a grain of salt because I cannot remember where I found this info so this might be another “Jho eating his tail” thing.