First time I've posted information here.
I've been using this method for a while now and had good success with it. It's going to only work on servers that have a degree of an economy as it relies on the fact that an item cannot be obtained on the other side (horde).
You're firstly going to want to make a night elf. Class doesn't matter as it's only the starting area that you want to be in.
Secondly, run to the second town from the first town (red line in below picture)
You will then want to log out at the place in the picture below.
Send the following to your newly created night elf from a main character or a character that has easier access to farming.
[7] Small Spider Leg
5 Silver
Now, Log onto your night elf character and take the [7] small spider legs and 5 silver from your mailbox, then run west to a small camp fire and train apprentice cooking from the vendor.
Then accept and complete the quest now available to your character from the cooking trainer.
You should be rewarded with the following
This item can only be obtained from this one spot in the game, therefore for the Horde or lazy / unknowing players, your auction (pretty much always the only one posted) is the only place to get it, thus you create the market and capitalize on this fact.
I generally sell 5 of these a week at the 700gp mark. Post one on the neutral AH and one on the faction specific AH to get most coverage. Don't saturate the market with more than one auction at a time.
3500gp a week.