Alchemy - Flask of the North? Is this in the game on Frostmourne?

Hi

I'm alchemy 450 and I don't have Flask of the North. I've gone to every Northrend trainer and none of them offer it. It's the one you can use in arena.

https://i.imgur.com/K2EhiHX.png


Anyone know how to get this recipe? Or if it's even in the game?

Thanks

comes with toc release

thanks very much