For me, a good book must mention food.
But a good number of the food say Nigerians, eat today should not be featuring in historical fiction set in the 13th century. No to cassava or peanuts but yes to watermelon (did you know watermelon is indigenous to the continent?) and African rice.
The “Lost crops of Africa” trilogy from the National Academies Press offers information on grain, fruits and vegetables indigenous to different parts of the continent. Some of the crops listed are hardly eaten today while others are still popular.
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