How can I get popcorn for Fluffy Fluffy Bun Bun?

Hint 1 of 6:

First of all, you aren't going to get popcorn already made for you.  The
designers of the game aren't going to make it that easy.

Hint 2 of 6:

You need to find some corn.

Hint 3 of 6:

You can take some corn from the field where the Carecrow stands.

Hint 4 of 6:

You need to heat the corn somehow.