Fascinating. If you can make something taste even vaguely like chocolate, you'd think you could make it support a superfluid of Cooper-paired electrons; that's much less complicated than the implied fitting-of-taste-receptor-potential-energy-surfaces going on with chocolate.
Can he make something just exhibit the magnetic-field-expulsing effect, so that it will float above a magnet even if it's not a superconductor?
(The classic Science Maniac Verrez maneuver would be to see if you can use Prestidigitation to turn a very tiny amount of something into antimatter, but that, obviously, Keltham is not going to talk about, or try until he's got a much better grasp on safety precautions.)