Bring 20 Vials of Troll Temper to Trenton Lighthammer in Gadgetzan.
The Sandfury trolls of Zul'Farrak make a tempering agent from sandstones, and I can use that to temper the goods I craft, yes I can! It is highly prized by connoisseurs, so if you bring me a good supply of the temper, then I'll reward you well.
Zul'Farrak is northwest of Gadgetzan. Good luck.