Matcha Swiss Roll

Classic Japanese roll cakes are very similar to western Swiss rolls. You can find flavors
such as vanilla, cocoa, chocolate, tiramisu, coffee, strawberry, lemon, raspberry and so on. Japanese (and some other Asian) varieties include matcha, black sesame, chestnut, purin (crème caramel), and interesting flavors like almond jelly, and mitarashi dango.
Matcha Swiss Roll 

Ingredients

• 4 large eggs (separated)
• ¾ cup cake flour (¾ cup = 110 g) (I use unbleached)
• ½ tsp baking powder
• 2 Tbsp matcha (green tea powder)
• ½ cup granulated sugar (½ cup = 110 g) (separated)
• 2 Tbsp whole milk (microwave until warm to the touch)

Matcha cream filling:

• ¾ cup heavy cream or heavy whipping cream (¾ cup = 180 ml) (chilled)
• 1 ½ Tbsp granulated sugar
• 2 tsp matcha (green tea powder)

Instructions

1. Separate the egg yolks and whites into two bowls. Keep the egg whites in the refrigerator, and the egg yolk at room temperature.

1. Preheat the oven to 375 ºF (190 ºC). Line a 15” x 10” (38 cm x 25 cm) jelly roll pan with parchment paper.

Make the cake batter:

1. Using a fine mesh sieve, sift the cake flour, baking powder, and matcha powder over a sheet of parchment paper.
2. Transfer the dry ingredients into the bowl, set the sieve over the parchment paper and sift 2 more times (total 3 times).
3. In a large bowl, add the egg yolks and break them.
4. Add half of the sugar (¼ cup) and whisk until the egg mixture becomes double in volume. When you lift the whisk into the air with some of the mixture on it, the mixture should fall back into the bowl in ribbons, which slowly disappear back into the mixture
5. Add the cold egg whites into a large bowl. With an electric hand mixer (or stand mixer), beat the egg whites until foamy.
6. Gradually add the remaining sugar (1/4 cup) over three separate times and beat until stiff peaks form and egg whites are glossy.
7. Gently whisk in ⅓ of the egg whites to the egg yolk mixture until incorporated in the batter.
8. Then add the mixture back into the egg whites. Gently fold in egg whites with a silicone spatula. Tip:Twist the bowl counterclockwise while you scoop up and fold in the mixture clockwise.
9. Add the dry ingredients and fold in gently with the silicone spatula.
10. Add the dry ingredients and fold in gently with the silicone spatula.
11. Pour the batter into the prepared pan. Spread the batter evenly with silicone pastry scraper.

Bake in the oven:

1. Tap the jelly roll pan a few times on your working surface to remove air bubble inside the batter. Bake for 12-13 minutes or until top of cake springs back when touched. Make sure not to over bake or the cake will be too dry and break when you roll.
2. Remove the pan from the oven and drop the pan on your working space once to prevent the cake from shrinkage.
3. While the pan is still hot, place a sheet of parchment paper and a baking sheet (or a cutting board) on top.
4. Wearing the oven mitts, flip the baking sheets together (with the cake sandwiched in between). Using a knife or spatula, lift the jelly roll pan to reveal the cake.
5. Gently remove the parchment paper attached from the cake. This side will be the exterior of the Swiss roll, so be gentle!
6. Place another “protective” sheet of parchment paper and baking sheet on top.
7. Hold both baking sheets and flip the cake over so that brown side is facing up. Remove the parchment paper.
8. Remove the baking sheet and place the cake on the working surface. Diagonally slice off ¼ inch (1 cm) one side of the cake (shorter end). This will help stabilize the Swiss roll when rolled up.
9. While the cake is still warm, use your hands to slowly roll the cake on the parchment paper. Once the cake is rolled up, transfer to a wire rack.
10. Cover with kitchen towel and let it cool completely (until it reaches room temperature, about 30 minutes).

To prepare matcha cream filling

1. When the cake is completely cool, combine the heavy cream, sugar, and matcha powder in a large bowl.
2. Beat until firm and spreadable, so it won’t ooze out of the cake when you’re rolling it up.

Assemble the Swiss cake:

1. Transfer the swiss roll to a flat surface and unroll the cake. It’s okay if the ends curl up a bit.
2. Using an offset spatula, spread the matcha cream mixture evenly over the cake, leaving a ½-inch border on all sides. A little tip: spread slightly less amount of filling toward the last 1/3 of cake as the cream will pile up toward the end when rolling up.
3. Carefully but tightly re-roll the cake. The seam side should be on the bottom. Once you roll up the cake, secure the roll by twisting the parchment paper at both ends (like a candy wrapper). Refrigerate for at least 2 hours to firm up the cream.
4. Remove and unwrap the Swiss roll. Slice off about ½ inch of the cake on both ends (to show off beautiful swirls). Transfer it to your serving dish. Slice and serve.
5. If you have leftovers, just re-wrap the swiss roll in a plastic wrap and store in the refrigerator for up to 3 days.

https://www.justonecookbook.com/matcha-swiss-roll/