How to make a Buche de Noel/Yule Log

How do you make the famous Christmas and holiday cake with the swirls? Easy, just follow along.
Ingredients:
6 egg yolks
½ cup white sugar
⅓ cup unsweetened cocoa powder
1 ½ teaspoons vanilla extract
⅛ teaspoon salt
6 egg whites
¼ cup white sugar
confectioners' sugar for dusting
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