1. Prepare the Sponge Cake

The sponge cake is the foundation of your Tiramisu Yule Log Cake, and it needs to be light and fluffy for a perfect texture. Follow these steps to create the base:

1. Preheat the oven to 350°F (175°C). Line a 10×15-inch (25×38 cm) baking sheet with parchment paper to prevent the cake from sticking.

2. In a large mixing bowl, whisk together the egg yolks, 1/2 cup (100g) of sugar, and vanilla extract until pale and fluffy.

3. In another bowl, sift together the flour, baking powder, and a pinch of salt. This step ensures a smooth, lump-free batter.

4. In a separate clean bowl, whisk the egg whites until soft peaks form. Gradually add the remaining 1/4 cup (50g) sugar, continuing to whisk until the egg whites form stiff peaks.

5. Gently fold the egg whites into the egg yolk mixture in batches, being careful not to deflate the mixture. Then, gently fold in the sifted dry ingredients.

6. Pour the batter onto the prepared baking sheet, spreading it evenly. Bake for 10-12 minutes or until the cake springs back when lightly touched.

7. Once baked, remove the cake from the oven and invert it onto a clean kitchen towel dusted with powdered sugar. Carefully peel off the parchment paper and roll the cake up in the towel from one short end to the other. Let it cool completely.

2. Prepare the Coffee Syrup

The coffee syrup adds the signature flavor of tiramisu to the cake. Here’s how to make it:

1. In a small bowl, mix together the cooled brewed coffee, sugar, and coffee liqueur (if using). Stir until the sugar is dissolved completely.

3. Prepare the Mascarpone Filling

The creamy mascarpone filling is what brings the tiramisu flavor to life. To make the filling:

1. In a large mixing bowl, combine the mascarpone cheese, powdered sugar, and vanilla extract. Beat until smooth and creamy.

2. In another bowl, whip the heavy cream until stiff peaks form.

3. Gently fold the whipped cream into the mascarpone mixture until well combined. If you’re using dark rum, fold it in at this stage.

4. Assemble the Yule Log

Now it’s time to bring everything together into a beautiful Yule log:

1. Carefully unroll the cooled sponge cake. Brush the entire surface with the coffee syrup to infuse the cake with flavor.

2. Spread a generous layer of the mascarpone filling over the cake, leaving about 1 inch (2.5 cm) around the edges.

3. Carefully re-roll the cake, ensuring it doesn’t tear. Place the rolled cake seam side down on a serving platter.

4. Spread a thin layer of the remaining mascarpone filling over the outside of the cake to create the “log” effect.

5. Use a fork to gently create texture on the surface, mimicking tree bark.

5. Decorate the Yule Log

The final touches are what make the Tiramisu Yule Log Cake visually stunning:

1. Dust the top of the cake with unsweetened cocoa powder for that signature tiramisu look.

2. Garnish with chocolate shavings or grated chocolate for added texture.

3. Optional: Add edible gold leaf or holly leaves for an extra festive touch.

6. Chill and Serve

To ensure the cake sets properly and the flavors meld:

1. Refrigerate the Tiramisu Yule Log for at least 4 hours, or overnight for best results.

2. Slice and serve chilled. This will give you the perfect holiday treat that is both creamy and light.