More on Hell Broth from Infoplease:

• Hell Broth - Hell Broth A magical mixture prepared for evil purposes. The witches in Macbeth made it. (See act ...
• hellbroth: meaning and definitions - hellbroth: Definition and Pronunciation
• William Shakespeare: Macbeth, Act IV - Thrice the brinded cat hath mew'd.
• Dictionary of Phrase and Fable: H - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "H"