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1
Bring the eggs to room temperature.
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2
Sift the flour 2-3 times.
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3
Line the mold with parchment paper.
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4
It sticks well if you grease the mold lightly.
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5
Combine the milk and butter in a container and heat up in a microwave.
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6
Melt the butter completely.
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7
Preheat the oven to 170C.
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8
Put the eggs into a bowl, add the sugar all at once and whip with a hand mixer (high speed) in a bain marie at about 60C.
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9
Check the temperature of the egg mixture and when it's 36C (it should feel a little warm when you touch), remove from the bain-marie and continue to whip at high speed.
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10
Use the same bain marie to keep the milk and butter mixture warm.
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11
When thickened (about 5 minutes from Step 3 to this point), whisk slowly at low speed for about 3 minutes.
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12
It looks shinier than when you whipped at high speed.
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13
Change to a whisk.
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14
Add 1 tablespoon of water and whisk gently (by adding water, the flour will mix in easily).
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15
Add the prepared flour in one go and whisk about 30~35 times.
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16
Remove the milk and butter mixture from the bain marie, and add a small amount of the batter from Step 8 into it and mix.
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17
It's easier to mix them this way than adding the milk and butter mixture as it is to the batter.
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18
Pour the Step 9 mixture into the batter from Step 8, and mix with a rubber spatula from the bottom 10-15 times.
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19
If the batter becomes creamy and shiny, it's done.
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20
Pour the batter from Step 10 into the mold.
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21
Tap it on the counter to remove air.
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22
Bake for 30-35 minutes at 170C.
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23
When you insert a skewer and it comes out with uncooked dough, bake for another 5 minutes while keeping an eye on the cake.
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24
When it's baked, drop it from a height of 20 cm to prevent it from shrinking.
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25
Place upside down on a cooling rack, remove from the mold and peel off the parchment paper.
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26
Cover with a tightly wrung out cloth to cool.
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27
When it's cooled completely, put it in a plastic bag to rest in the fridge for 1/2-1 day.
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28
Doing so, the sponge cake will settle down and become easier to slice.
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29
Slice into your desired thickness.
