It goes with almost every big loot or global from big Berycleds (probably now not with every, as more people have begun hunting them after introduction of the iron missions and loot is more spread out, but still it's a common item). Definitely tt food.
We could start a rumor that these are used to convert regular quad-wing to Equus version.
Currently these are tt food. However, I suspect in the near future there will be a new use for them. With that in mind I used to buy tt plus few peds.
So I'd recommend you to start storing them for future use.
It goes with almost every big loot or global from big Berycleds.