Keng no mai sai yanang ) also known as gaeng nor mai, gaeng naw mai, gaeng nomai, kaeng no mai, kaeng nomai, kaeng Lao or Lao bamboo soup is a traditional, commonly served soup from Laos. The traditional recipe for keng no mai served to Laotian royalty can be found in a collection of handwritten recipes from Phia Sing (1898-1967), the king's personal chef and master of ceremonies. Phia Sing's handwritten recipes were compiled and published for the first time in 1981. The dish is also found in Isan, the Lao ethnic region of northeastern Thailand.