It's a Northeastern phrase, a lyric from Xuecun's "All Northeasterners are Living Thunderbolts". Over time everyone has become familiar with the phrase Cuihua on sauerkraut. Northeastern people all love to eat sauerkraut, and Cuihua represents the beautiful northeastern girls. The Northeast Winter Northeast Love also mentions Cuihua, but there is no Cuihua on sauerkraut in the next sentence.