Walkthrough: Once you find the Power Moon, the path to Meat Plateau will become accessible. There are a few ways to get across: taking the path to the left over the gates, using another Lava Bubble to hop up the platform to the right, or by going straight across. You can obtain a Power Moon by lighting the torch in the middle of the path with one of the Lava Bubbles.
Once on the other side of the path, dodge more of the Hammer Bros as you ascend your way upward. If you'd like, you can check around the right side before you do in order to use Cappy on the Volbonan in the wall to obtain more Purple Coins. Otherwise, make your way down the narrow paths that intersect and crisscross above, knocking away any Spinies with the help of Cappy.
On the top of the plateau is a giant chunk of meat. On top of it is a button that you can use Cappy to gain control of. You won't be able to do much as the piece of meat, outside of being able to break the salt encasing nearby. Since you can't do much, make your way off the plateau and straight into the hands of Cookatiel himself. He'll drop you, as the piece of meat, into the stew, causing Mario to traverse all the food to reach the Multi Moon at the top. After doing this, however, the volcano will explode, causing certain parts of the map for this kingdom to change drastically.