Well we gave him the molasses, now let's feed him the sulfa.
This is completely opaque to me. Molasses while delicious when added to some foods is not something one normally eats outright, neither for satisfaction nor for medicinal purposes that I'm aware of. Sulfa likely refers to a group of early antibiotics that was used extensively during World War II.
But I don't see the connection between molasses and sulfa, within the context of the film or without.