Fluffy Castella Sponge Cake

Ingredients

  • 6 egg whites
  • 6 egg yolks
  • 85 g sugar (superfine or caster is ideal)
  • 80 ml vegetable oil
  • 90 g cake flour or sponge flour
  • 70 ml milk
  • ¼ tsp salt

Instructions

1: Whip the Meringue

  • In a clean, dry bowl, beat the egg whites until they become foamy.
  • Gradually add sugar and continue whipping until stiff peaks form the meringue should be glossy and stable.

2: Prepare the Batter Base

  • Heat the oil for 90 seconds in the microwave or gently on the stove. It should be warm but not boiling.
  • Add sifted flour and salt into the warm oil and mix until smooth.
  • Stir in the egg yolks and milk, mixing until you have a silky, lump free batter.

3: Fold in the Meringue

  • Take one third of the meringue and gently mix it into the batter to loosen it.
  • Then, fold in the remaining meringue in two more additions, using a spatula and gentle motions to keep the batter airy.

4: Pour and Tap

  • Pour the batter into a parchment lined square or loaf tin (avoid greasing the sides).
  • Tap the tin on the counter several times to remove air bubbles that might cause holes during baking.

5: Water Bath Baking

  • Place the cake tin inside a larger baking dish and fill the outer dish with hot water halfway up the sides.
  • Bake in a preheated oven at 150°C (300°F) for about 60 minutes, or until the center springs back and a toothpick comes out clean.

6: Cool and Slice

  • When done, gently bang the tin on the counter a few times to release steam and prevent shrinking.
  • Let the cake cool completely in the tin, then transfer to a cutting board and slice with a serrated knife.

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