Steamed sponge cake (bolu kukus)

Ingredients

• * 5 egg yolks
• * 4 egg white
• * 250 g granulated sugar
• * 300 g flour
• * ½ teaspoon baking soda
• * 175 cc soda water (Sprite/7Up)
• * ½ teaspoon vanilla
• * 1 tablespoon cocoa for coloring

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Preparation

• Cover approx. 20 tin cups used to steamed the cakes with parchment papers then put them into a steamer pot with boiling water.
• Mix egg yolks, egg white, baking soda, sugar and vanilla until they make a smooth batter then put in turns, ½ portion of the flour, ½ portion of the soda water until all of them are used, mix well.
• Take 5 tablespoons of the batter and put it in a separate bowl. Pour in the cocoa and mix well.
• Pour the white batter into the tin almost to the top then pour in 1-2 teaspoon of the cocoa batter on top. Do this until all the batter is used up, 20 tin cups.
  
• Close the steamer lid, let it steamed for 20 minutes with high temperature. Then use low temperature for another 5 minutes.