An overwhelming majority of what we eat is made from plants and animals. This means that composition of our almost entire food is chemicals from the realm of organic chemistry (carbon-based large molecules). Water and salt are two prominent examples of non-organic foodstuffs - which come from the realm of inorganic chemistry. Beside some medicines is there any more non-organic foods? Can we eat rocks, salts, metals, oxides… and I just don’t know that?
Sure, but it still works for actual iron deficiencies, even if that wasn’t the anaemia cause Cambodians were dealing with.
I’m actually considering buying one for myself, I mostly eat vegetarian foods.
Cooking in a cast iron pan will give you even more iron.
True, but they’re very heavy and I can’t just throw cast iron in the dishwasher.