This is a very odd but fun quest.
Razorthorn Rise is located just north of Razorthorn Shelf between Terokkar Forest and Hellfire Peninsula. Razorthorn Shelf was the location of the level 60 quest where players had to pick up Razorthorn eggs.
The goal of this quest is the razorthorn plant, which is buried beneath mounds of dirt (both pictured). You have to get under the dirt to get to the root, but to do so, you need the Razorthorn Ravagers in the area to dig it up for you.
To get the Razorthorn Ravagers, you must obtain a Razorthorn Flayer Gland from the Razorthorn Flayers which are in the area.
How does all this work?
You must kill the Flayer, loot the gland, use the gland on the Ravager and suddenly you're a hunter, with your own ravager pet. Use the pet abilities (which appear above your hot bars like a normal hunter pet) to dig up the dirt, then loot the root. It works like a normal hunter pet, too, so CTRL-1 will cause the pet to attack whatever you target.
The pet will stick with you for a while. I was able to get all my roots with only one pet (and therefore only one gland) and have plenty of time to spare. Once you fly out of the area, the pet will despawn (else, follow you on the ground and die or just follow you until you reach the edge of the area).
Totally easy quest.
I should add that the coordinates for the flayers are at about 31.5, 84.0 if you're on the Hellfire Peninsula map or 60.0, 11.0 if you're on the Terokkar Forest map; the whole ridge along this section is covered in them. I also strongly suspect (I am a shaman and therefore cannot prove this) that if you're a hunter your pet will have to be put away.
A question to a hunter:
I'm curious if there is a hunter out there who could answer this question.
If you tame this pet, does it retain its ability to dig up the roots? - Answer (by Frostfel) - No! You do not get the ability.
Thanks, Frostfel!