Nailao, also known as Beijing yogurt (Chinese: 北京酸奶; pinyin: Běijīng suānnǎi), is a traditional fermented milk drink that is popularly consumed throughout China.

Nailao (or suānnǎi) is prepared by heating milk and adding sugar to it.

The milk is mixed with rice wine and honey or sugar and is rapidly poured into fifty small bowls.

The bowls are then stacked along the inner wall of the yogurt barrel, heated for about thirty minutes, and later cooled.

Places that sell suānnǎi traditionally serve it in ceramic containers that must be returned to the vendor.