Salt from Puuloa.
From old times, Hawaiians knew how to make salt. It was used to season food and to trade with, and yet the salt from Hawaii was not very good. Beef or pork salted with this salt was not so good. If it was left for a while, it would rot. Now however, the salt made at Puuloa is very good; the bitter contents are removed, and they have a mill that grinds it like flour, and like salt from foreign lands. Therefore, the salt from Puuloa is under great demand; it is exported and the land profits.
(Hae Hawaii, 7/25/1860, p. 70)