Ethnogastronomic study of malay gulai masam in North Sumatra: Preserving traditional culinary heritage to support food securityJamilah Nasution, Nursahara Pasaribu, Marina Silalahi and R. Hamdani HarahapBIO Web Conf., 186 (2025) 04007DOI: https://doi.org/10.1051/bioconf/202518604007