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Place egg yolks and sugar in a mixing bowl and beat until lemon colored.
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Add flour, a little at a time, blending it in well.
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Add vanilla and lemon rind (if using it).
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Beat egg whites until stiff but not dry and fold into cake mixture.
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Butter and flour a 18inch square (or a 9 x 13 x 3, or a 11 x 17 x 2inch half-sheet) cake pan**.
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Pour cake batter into prepared pan and bake at 375°F for 40 minutes, or until toothpick inserted in center comes out clean.
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Remove cake from oven and turn out (of pan) onto a cake rack to cool.
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When completely cool, cake may be sliced horizontally to form 2 or 3 thin layers.
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Cake can be tightly wrapped and frozen (up to 3 weeks) for future use.
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**Please check your oven size, to make sure pan will fit properly.