MENGJI, China/PARIS, June 20 (Reuters) - Li Fengshan grew up so poor he could only afford one meal a day. Today, the 50-year-old drives a white Maserati SUV, funded by ballooning foie gras profits from his geese farm in eastern China. Over the last 10 years in China, foie gras — the fattened livers of force-fed ducks or geese — has gone from a high-end delicacy to a popular affordable product, spurring farmers like Li to become even more ambitious.