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Using a carrot peeler, remove the zest of 3 lemons, being careful to avoid the white pith.
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Put the zest in a food processor fitted with the steel blade.
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Add the sugar and pulse until the zest is very finely minced into the sugar.
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Cream the butter and beat in the sugar and lemon mixture. Add the eggs, 1 at a time, and then add the lemon juice and salt. Mix until combined.
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Pour the mixture into a 2 quart saucepan and cook over low heat until thickened (about 10 minutes), stirring constantly.
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The lemon curd will thicken at about 170 degrees F, or just below simmer.
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Remove from the heat and cool or refrigerate.
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Once your cheesecake has cooled (but before chilling) cover the top with a generous amount of cooled curd.
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I finished mine off with some whipped cream topping (a request from my taste-tester) by simply beating on high 1 cup of heavy whipping cream and 3tbsp sugar until stiff peaks form. I then piped it on to make an attractive finish. You can also just use canned whip cream too.