For key visual process steps, refer to the body of the blog post.

Make the cake:

Cup of Yum
1. Preheat oven to 375°F/191°C.
2. Prepare a 9" by 13" baking sheet by lining it with parchment paper. Set aside.
3. In a large bowl, add in the egg yolks, 30g granulated sugar, pinch of salt, vegetable oil, cooled coffee and vanilla extract.
4. Whisk until combined.
5. Sift in cake flour and stir or whisk until just incorporated. Set aside.
6. In the bowl of a stand mixer fitted with a whisk attachment, add in the egg whites and begin whipping on medium-low speed until foamy.
7. Add in cream of tartar, and gradually increase the speed.
8. Gradually add in the remaining 30g granulated sugar, and continue whipping until the egg white meringue reaches soft peaks.
9. Take about ⅓rd of the whipped egg white meringue and fold it into the coffee egg yolk batter to lighten using a spatula.
10. Continue folding in the egg whites in ⅓rd additions, until all incorporated into the batter.
11. Pour batter into the prepared baking tray.
12. Give the tray a few taps on the counter to release any trapped air bubbles.
13. Smooth the surface with an offset spatula.
14. Bake at 375°F/191°C for 13-15 minutes, or until the top of the cake is springy and dry to the touch.
15. Remove the cake and bang the tray on the counter to prevent shrinkage.
16. Transfer the cake to a wire rack to cool (not completely).

Make the coffee cream filling:

1. In a mixing bowl, combine heavy whipping cream, espresso powder, and powdered sugar.
2. Whip until the coffee cream reaches firm peaks. Be careful not to overwhip or it will turn to butter.

Assemble:

1. While the cake is slightly warm, peel off the parchment paper.
2. Transfer the cake to a large clean parchment paper.
3. Spread the coffee cream on the surface of the cake and smooth with an offset spatula.
4. Beginning from one end (long or short, up to you), roll the cake all the way, ending with the seam side facing down.
5. Wrap up the cake with parchment and seal the ends.
6. Place onto a tray and into the fridge to set for 4 hours.

Serve:

1. Trim off the edges of the cake using a sharp serrated knife.
2. Decorate with additional whipped cream and coffee beans as a garnish.
3. Cut the cake into slices and serve as a dessert, or a snack.