According to Official Guinness Records,
The largest cookery lesson was achieved by 6,334 people during an event organised by See Joyde and One Plus One Natural Flour (both China), in Zhengzhou, China, on 20 December 2015.Local families participated to the record attempt and the final dish chosen for the cookery exercise was 'vegetable dumplings'. One of the goals of the record was to encourage children to learn about traditional Chinese culture and, at the same time, give parents and their children a chance to have fun together.
For a complete list of 2015 records, please visit 2015 Guinness Records in China.