Soft Castella Sponge Cake

▪️ Preparation of ingredients:

Gather all ingredients at room temperature for best results, especially the eggs and milk.
Sift the flour and salt separately, then set them aside.
▪️ Beat the egg whites:

In a large bowl, beat the egg whites on medium speed until foamy.
Gradually add 50g of sugar while continuing to beat. Increase the speed until stiff peaks form (try not to overbeat to avoid a brittle meringue).
▪️ Batter Preparation:

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