INGREDIENTS
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Crust and Streusel
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2/3 cup sugar
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10 Tablespoons softened butter
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2 1/2 cups all purpose flour
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1/2 cup unsweetened cocoa powder
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1 large egg
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Filling
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3 eggs, separated
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1/2 cup plus 2 tablespoons sugar, divided
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1/8 teaspoon salt
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1/3 cup cornstarch
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1/2 cup oil
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lemon zest from 1 lemon
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1 teaspoon vanilla extract
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4 cups plain yogurt (or 2 cups quark)
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* Quark is A soft, unripened cheese with the texture and flavor of sour cream.