I have to be honest, I've never watched Hocus Pocus. It's one of those cultural touchstones I missed somehow and I keep meaning to and forgetting. So since I don't really know the movie, Adeline (thanks for the name Kelsey Thomas!) is just doing one of the most stereotypically witchy things I could think of: brewing something in a giant cauldron. Is it a poison? A healing potion? Is it just an enormous batch of bone broth? Who can say?