Oh, come and stir my cauldron,
And if you do it right,
I'll boil you up some hot strong love
To keep you warm tonight.
-- sung by Celestina Warbeck on the Wizard's Wireless (HBP16)
A Cauldron Full of Hot, Strong Love is the title of a Celestina Warbeck popular song.
Some Muggles who had inadvertently picked up a Portkey on Clapham Common were transported to a Celestina Warbeck concert, where one was invited onstage during this number. In spite of a Memory Modifying Charm being applied, the Muggle wrote a hit song very like to the original. Celestina was said to be "not amused" (Pm).