“Nutritional composition and antioxidant activity of Gynura procumbens (Lour.) Merr. – a common Vietnamese wild vegetable” Authors: Tran Thi Hong Hanh et al. Journal: Vietnam Journal of Chemistry , 2019, 57(3), 321-327. DOI: 10.1002/vjch.201900049 (Shows high polyphenol content, often used in hot pots or with rice.) If you mean Cơm xanh (Green rice – Com xanh ) This is a famous delicacy from Làng Vòng (Hanoi). Academic papers focus on its processing and preservation.