This ultimate soft and fluffy Japanese sponge cake is the secret to creating those stunning Japanese-style cakes. With just 5 simple ingredients, this cake is baked to absolute perfection.
Preheat the oven to 390°F (200°C). Sift flour with a flour sifter in a clean mixing bowl and put aside. Place butter and milk in a small bowl over another container with hot water and warm them up at 122°F (50°C).
Grease a 6-inch (15 cm) springform pan with softened butter, dust with flour, and remove excess. Or line the bottom of the pan with a parchment paper circle and the sides with parchment strips.
Place whole eggs and granulated sugar in a heat-resistant bowl or the bowl of a stand mixer. Bring it over a bain-marie or water bat, and beat with a handheld mixer at medium speed until the temperature reaches 97°F to 100°F (36°C to 38°C), 104°F (40°C) at maximum.
Remove the bowl from the hot water bath, and beat with an electric or stand mixer at high speed for 8 minutes. Lower the speed to medium and beat for 1 minute. Then switch to low speed and beat for the other 2 minutes. The egg mixture must triple in volume and reach a ribbon stage. Stop the mixer and stick a toothpick into the beaten eggs. If it holds upright, you are done with whipping.
Add the sifted cake flour while sifting again over the bowl and gently mix it with a rubber spatula. Turn the bowl counterclockwise, scooping the batter from the bottom of the bowl until the flour disappears. In terms of spatula movements, it has to draw the letter "J" passing the bottom of the bowl from 2 to 8 o'clock, lifting the batter, and returning it.
Add a scoop of the batter into a bowl with milk and butter preheated to 122°F (50°C) and mix with a spatula. Pour the cake batter mixture back into the principal preparation, and scoop the batter from the bottom of the bowl with a rubber spatula. Turn the bowl counterclockwise at the same time.
Pour the batter into the prepared mold, and tap the bottom lightly against the table to remove air bubbles. Lower the oven temperature from 390°F to 340°F (200°C to 170°C), and bake for 27-30 minutes.
Remove the baking pan from the oven and tap the mold from a height of about 4 inches (10 cm) against the table to prevent it from shrinking. Let the cake cool in the pan for 5-10 minutes.
Turn the mold upside down on a wire rack and let it cool for 5 minutes. Then turn it over so that the grilled side is facing up, and let it cool with the paper still on until cooled down completely.
Keywords: japanese sponge cake