The potato--worth its weight in gold.
D005060:Europe; D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D009747:Nutritional Physiological Phenomena; D013020:South America; D006113:United Kingdom; D014481:United States; D014675:Vegetables / Q000266:history