Samgyetang is a chicken ginseng soup traditionally consumed during Boknal (복날) days: the hottest days of summer. It is a Korean custom to eat hot food in hot weather called Iyeolchiyeol (이열치열), which means "controlling heat with heat". Consequently, Samgyetang is Koreans' favorite energizing food and it is common to have it on sambok (삼복) days — Chobok (초복), Jungbok (중복) and Malbok (말복) — which are believed to be the hottest days in Korea.