in my wildcrafting days, we'd eat a kind of wild purslane that grows on the beaches, in hawaii.
it tastes presalted, quite pleasantly so.
let's not forget how important sea minerals are for the health of those living in landlocked areas, too.
the goitres here in umbria until recently are a case in point. The person who says it cannot be done should not interrupt the person doing it. Chinese Proverb.
