| Mix cornstarch and sugar in the small saucepan. Add lemon and water; whisk until well mixed. Cook, stirring constantly, for at least 5 minutes, until thick. Pour into bowl, stir in lemon zest, and set aside to cool. Beat egg whites at high speed just until they form stiff peaks. Fold egg whites into lemon mousse, cover, and chill for an hour. Whip the cream and fold into mousse, cover, and chill for at least ½ hour.
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