The important natural resource in West Africa that the Songhai Empire controlled was salt.
This salt was predominantly found in the Sahara desert - there are still a lot of salt mines in this West African desert. The Songhai Empire heavily relied on salt trade, which brought most of its money into the empire - this is the reason why it was so powerful at the time - because of salt and gold.
The answer is Naturalization
Berries, I’m pretty sure berries are not one of the middle east’s major crops. Wheat and cotton definitely are, and so is citrus I believe, so I’d say berries is your best bet.
