Currently the best Spellpower buff food in the game, although a few other food give the same buff. Glacial Salmon is very easy to fish, so the most difficult part will be to get your Northern Spices.

To make yourself a nice stack of these, you will need to:

1. Raise your Cooking skill to 400, and ensure you have a Fishing skill of at least 475 buffed (including lures and items) to avoid fish getting away.

2. Complete the Cooking Daily quest to get yourself 3 Dalaran Cooking Award and enough Northern Spices.

2. Buy Recipe: Firecracker Salmon.

2. Go to Grizzly Hills and fish Glacial Salmon. The rivers and lakes of Grizzly Hills are abundant with Glacial Salmon, so you should have a stack in no time.