Japanese buttery cake

Sponge cakes are always so special as it requires very less time for making and they are  really really spongy without even the use of the baking powder . This recipe had been in my try-out  list for a long time. I got this recipe from the blog "japanesecooking101.com" and I simply loved it. While making this recipe please be watchful while double boiling egg and sugar mixture since the egg might get cooked if u leave it for more than a minute. And if that part is done with care, you are sure to enjoy a very very spongy wonderful cake. And while adding the flour ,it is not needed to beat the whole mixture. Just fold it so that the ingredients get to know each other. I got inspired by this recipe and am looking forward try more japanese recipes. Hope you love it too.

Ingredients :

1.Butter - 3 Tbsp
2. Milk - 1 Tbsp
3.Cake flour/All purpose flour- 3/4 cup
(1 cup = 210 ml)
4. Eggs - 3
5. Sugar - 3/4 cup
6. Vanilla extract - 1 tsp

Method :

1.Preheat the oven to 350 F (180 C) at least 20 minutes . 
2.Line a 7" cake pan with parchment paper (bottom and side).
3. Put butter and milk in a small bowl and microwave until the butter melts.
4. In another bowl, sift the cake flour 2 times. Set aside.
5. In a large bowl , add eggs and sugar. Over a double boiler (placing the bowl over a pot with simmering water on low heat), whisk the egg mixture until it becomes lukewarm (until the sugar dissolves). Then set the bowl on the stand mixer, and whip the egg mixture until very thick and white in color . Add vanilla essence and mix.
6.Add sifted cake flour in 3 parts. Fold in the first one-third of the flour by hand with a spatula (not with the mixer). After the flour is incorporated, add the next part of flour and again fold in with the spatula. Repeat. Next, add the mixture of melted butter and milk and fold in with the spatula.
7.Put the batter in the prepared pan. Bake for 20-25 minutes.
8.Take the cake out of the oven and leave for 15 minutes. Then enjoy.