• prep: 0 hr
• cook: 0 hr
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servings:

Layered and light, the tiers of this cake call for cholesterol-free egg whites and skim milk; the berries in between are thought to be brain boosters.

• Vegetable oil, cooking spray
• 1 1/2 cups cake flour (not self-rising), sifted
• 1 tablespoon baking powder
• 1/2 teaspoon salt
• 1/2 cup plus 2 tablespoons granulated sugar
• 1/2 cup skim milk
• 1/3 cup canola oil
• 1 1/2 teaspoons pure vanilla extract
• Finely grated zest of 1 lemon, plus 1 teaspoon fresh lemon juice
• 4 large egg whites, room temperature
• 1 tablespoon confectioners' sugar
• 4 large egg yolks, lightly beaten
• Finely grated zest of 1/2 lemon, plus 1/2 cup fresh lemon juice
• 1 1/3 cups granulated sugar
• 1/3 cup cornstarch
• Pinch of salt
• 1 teaspoon pure vanilla extract
• 1 1/3 cups blueberries, lightly crushed

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