In the Kansai region, serving three slices of takuan is for good luck (Sanpo or three directions and the number 3 is considered auspicious) whereby some donburi ('rice bowl dish' consisting of fish, meat, vegetables, or other ingredients simmered together and served over rice) restaurants in Kansai serve three slices of takuan on purpose.
関西では沢庵付けを三切れ出す事は縁起を担ぐ（三方）ものとされ、関西の丼専門店ではあえて三切れの沢庵付けを出す店もある。