I picked myself up a nice 青木瓜 (qīng mù guā) today. 995g / 2lb 3oz of 'green tree melon' to give the literal translation. What you know as a green papaya, Carica papaya. Originally, native to Mexico and Central America, they are now widely cultivated across SE Asia and southern China. I feel a Thai (มะละกอ), Laotian ((มะละกอ), Cambodian (ប៉ាផាយ៉ា), Vietnamese (đu đủ) papaya salad in my near future. It's rock solid at the moment.