I'm not from Heilongjiang, nor do I know someone who is, but I've found some facts about kvass, (格瓦斯 or géwǎsī.) I can add some links below, and maybe someone else can write or research more, but I wouldn't like to touch on a topic I'm mostly unfamiliar with besides a few Google searches.

https://www.qlkbac.com/

https://eatyourworld.com/destinations/asia/china/memories/the-unique-delights-of-gewasi-or-kvass-in-china/ AtTheTownHouse (talk) 03:09, 16 May 2025 (UTC)Reply

It's always fine to add reference links on talk pages. Ikan Kekek (talk) 04:06, 16 May 2025 (UTC)Reply