This is something my mom would make very often when I was growing up. The cake is soft and airy, and the fudge makes it decadent. And the best part is that it is so easy to make. My mom would always dust it with some icing sugar, I just added some matcha because I love how it combines with the chocolate. It gives it a slight earthiness.
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For the cake:
6 tablespoons of all-purpose flour
6 tablespoons of cocoa powder
1 cup of sugar
For the fudge:
1 cup of milk
1 can of condensed milk
½ cup of sifted cocoa powder
1 teaspoon of butter
For the matcha icing sugar:
3 tablespoons of icing sugar
1 tablespoon of matcha
First make the fudge, You can do this a few days ahead and keep it in the fridge. Pour the milk into a medium saucepan, add the cacao powder and whisk it until well combined. Then add the condensed milk and stir with a wooden spoon over medium-low heat. You have to stir constantly to avoid it from burning. This will take about 20 minutes. When the fudge is thick and you can see the bottom of the pot, add the butter. Mix well and pour into a bowl to cool down. It will thicken even more as it cools down. Let it cool down completely before starting to make the cake.
To make the cake, preheat the oven to 180C/350F. Sift the cocoa powder with the flour.
Whisk the egg whites with half of the sugar until stiff peaks form. In another bowl, whisk the egg yolk with the remaining sugar. Then add 1/3 of the egg whites to the bowl with the yolks and mix it well. Then fold in half of the remaining egg whites. Finally fold in the rest of the egg whites until it is all mixed through. Then fold in the sifted cocoa powder and flour.
Pour the cake batter into a baking sheet lined with parchment paper. Smooth it out with a spatula and tap it a bit to remove air bubbles.
Bake it for 15 minutes.
Once it is baked, remove it from the baking sheet by grabbing the parchment paper and place it on a cutting board. Let it cool for about 3 minutes and then grab one of the short ends and roll it with the parchment paper. Leave it rolled for about 5 minutes to cool down a bit. I find that this helps it mold better without it cracking. Once it has cooled down a bit, start spreading evenly the fudge. Then tightly roll it taking the parchment paper off as you roll. Transfer it to a plate and place it in the fridge for 1 hour to set.
Once the roulade has set, sift the icing sugar with the matcha. Once it is mixed, dust it over the roulade. Enjoy!