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In a deep dish, microwave the butter for one minute on 100% power.
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Grate the lemon rind and squeeze out the juice.
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Add the castor sugar, lemon rind and juice to the butter and mix well.
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Strain the mixture through a sieve and discard the rind.
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Beat the eggs and add to the butter mixture.
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Microwave the mixture, uncovered, for 4 minutes on 100% power, stirring at 1 minute intervals.
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Microwave for another 30 seconds, then test to see if it is thick enough.
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Dip a metal spoon into the curd and pull it out quickly. If the curd is thick enough, the back of the spoon should be coated with a fairly thick layer of the mixture. The lemon curd wll thicken even more as it cools.
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Pour the hot curd into dry, sterilised glass jars, cover with greaseproof paper and screw the lids down tightly.