Asking a non-magic friend for salt, and then specifying that you meant figurative salt, as opposed to literal, is the most common way of harvesting standard, kitchen table figurative salt.
For pure, concentrated figurative salt, one must travel to a Figurative Salt Mine. It is advised that only one person at a time enter the mines, as the experience is known to cause havoc in personal relationships.
The same is said about Figurative Sugar Fields.