The cake, called Phuong Hoang Vu-Bat Phong Hoi Dau (Royal Phoenix Cake), measured 6.8m long and 4.2m wide and was made using 3.5 tonnes of coal.
It consisted of 4,862 items made from mung bean, rice flour, and vegetables and required the assistance of 18 people over three months.
The duo used the original ingredients used by Tran Vien of the Hue Imperial Palace in 1925.
The entry was submitted by the Vietnam Book of Records, or Vietkings.
