The easy Yule Log/Bûche de Noël cake is based on a roualde fluffy dough. Swiss rolls are made the same way but the difference with the yule log is the decoration. In this yule log recipe the filling is with a chestnut paste. You can make your own or use a store bought ready made chest nut paste. You can also use jam as a filling or flavored whipped cream or even chocolate! The yule log is best enjoyed within 48 hours of it's inception as it tends to remain soft during that time.