You can find an NPC that will give you some basic information. If you head to the east-most segment of the map on the Great Sky Island, you'll discover an NPC called the Culanary Consort hidden away in one of the small stone huts. If you talk to him, he'll explain the basics of advanced cooking with a pot. I've included everything you need to know here in this article, but you can quickly travel to this location and talk to him if you forget!