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In the top of a double boiler, beat eggs and sugar until the sugar has dissolved.
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Stir in the ruby grapefruit juice , ginger juice, butter and grapefruit peel.
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Cook over simmering water for 15 minutes , stirring all the time so that it does not become lumpy.
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Pour into glass jars and store in the fridge once cooled.
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To Make ginger juice : Peel and grate the freshest piece of ginger you can find. Mash through a sieve to obtain the juice.