"The spice must flow" has this historic antecedent. At times pepper's taste, preservative, alleged health value and price was off the scale, not unlike Dune spice.
Are you sure pepper has preservative properties? Any link/reference would be appreciated, I hadn't heard of that before. A quick check of Wikipedia didn't find anything either.
As a Preservative: The value of pepper as a natural preservative for meat and other perishable foods has been known for centuries. Studies have shown that this is due to the anti-oxidant and anti-microbial properties present in pepper.