INGREDIENTS
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Cooking-oil spray
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4 large eggs plus 7 egg whites, divided
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1 1/2 cups sugar, divided
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1 teaspoon vanilla extract
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5 tablespoons lemon zest, divided
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3/4 cup cake flour (not self-rising)
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1/3 cup unsalted butter, melted and cooled
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2 pints premium strawberry ice cream, softened
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1 pint premium vanilla ice cream, softened
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1/4 cup fresh lemon juice
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1/4 teaspoon cream of tartar