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In Wrath of the Lich King, getting your cooking beyond 400 or so requires completion of a number of Daily Quests to get recipes that allow you to level. You are rewarded one or two Dalaran Cooking Awards which are a currency used to purchase recipes and Northern Spices. Upon completion of the daily, you are also given a Spice Bag which contains a few Northern Spice — required for each cooking recipe obtained in Dalaran.

If you have an alt that has cooking 375 and is level 70, you can buy the spice on one account and send it to your main account, however, recipes are soulbound. All recipes turn green around 440, so, getting those last 10 levels is going to be fun.