"Citrus traces the history of today's global superfood from its cultivation in the ancient world from three original 'true' species, via Arab trade routes, the noble collectors of medieval Europe, imperial conquerors on the high seas, and merchants risking ruin for the highest-value fruit crop ever known. The story of citrus permeates human history, as recorded in the literature and art of civilisations from antiquity to the present day. When Alexander...