The rhizomes of this flowering plant, Hypoxis angustifolia, were cooked by early humans. © Lyn Wadley January 15, 2020 How we deduced that our ancestors liked roast vegetables too Lyn Wadley, University of the Witwatersrand and Christine Sievers, University of the Witwatersrand The charred remains of root vegetables found at Border Cave help us understand how early humans survived and thrived.