Classic Chocolate Yule Log Recipe

Ingredients (18)

• 2 1/2 ounces pistachio oil, roasted hazelnut oil, or melted butter (about 1/3 cup; 70g)
• 2 1/2 ounces finely chopped dark chocolate, between 85% and 100% (slightly rounded 1/3 cup;70g)
• 1/2 ounce vanilla extract (about 1 tablespoon; 15g)
• 5 large eggs (8 3/4 ounces; 250g)
• 5 3/4 ounces sugar (about 3/4 cup; 165g)
• 1 tablespoon instant espresso powder
• 3/4 teaspoon baking powder
• 1/2 teaspoon (2g) Diamond Crystal kosher salt; for table salt, use about half as much by volume or the same weight
• 1/2 teaspoon baking soda
• 1 1/4 ounces water (about 2 1/2 tablespoons; 35g)
• 3 3/4 ounces bread flour (about 3/4 cup, spooned; 106g)
• 12 ounces finely chopped dark chocolate, between 55% and 75%, or a blend thereof (about 2 heaping cups; 340g)
• 12 ounces heavy cream (about 1 1/2 cups; 340g)
• Salt and vanilla to taste
• 2 cups sweetened whipped cream, buttercream, or other frosting, see note (weight will vary)
• Matcha powder, optional
• Cocoa powder, optional
• 1 recipe meringue mushrooms, optional