sponge cake and filling, mom

Ingredients For sponge cake and filling, mom

• 3 tsp

  baking powder
• 1/2 tsp

  salt
• 2 c

  cake flour, plus 2 tablespoons cake flour
• 1 1/2 c

  sugar
• 5

  egg yolks
• 3/4 c

  water
• 1/2 c

  oil
• 1 tsp

  lemon extract
• 2 tsp

  vanilla
• 7

  egg whites
• 1/2 tsp

  cream of tartar
• 2

  egg yolks
• 3 c

  milk
• 3/4 c

  sugar
• 4 Tbsp

  cornstarch