Travel to Stormwind and take the portal to Deepholm. Seek out Ormhun Stonehammer when you arrive.
Look, you're gonna have to travel to some place called Deepholm and find an earthen down there.
The guy who sold the recipe to me said he got it from an earthen called...Ormhun! Ormhun something.
I don't know too much about that place, but maybe you can ask the locals or something where he lives.
Now if you don't mind, I have more recipes to sell.