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In a small heavy saucepan or the top of a double boiler, combine egg yolks, ¼ cup sugar, lemon juice and rind.
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Whisk over low heat just until creamy and slightly thickened.
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Cool.
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Beat egg whites to soft peaks; gradually add ¼ cup sugar, beating to stiff peaks.
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Fold into lemon mixture.
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Whip cream and fold in gently.
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Sprinkle pan or baking cups with a thin layer of vanilla wafer crumbs and pour mixture over.
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Freeze until firm.
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To serve, unmold individual mousses from baking cups or cut mousse in pan into squares.