It specializes in the beef soup dish seolleongtang,[1] and is among the oldest gukbap restaurants in Gyeonggi Province.

The dish was often improvized, based on whatever ingredients she could access; as such she called it utang (우탕; 牛湯; lit.

Lee reportedly spent significant time each day trying to acquire ingredients for the soup from various butchershops.

The name literally means "An[seong] one store", and is interpreted as "the most relaxing business in Anseong" (안성에서 제일 가는 편안한 가게).

[1] The restaurant was featured in the television program Baek Jong-won's Top 3 Chef King.