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Makes about 2 cups
In
a large bowl with an electric mixer, beat
butter and sugar with an electric mixer until well combined, about
2 minutes. Slowly add the eggs and egg yolks. Beat for another minute
then mix in the lemon juice and zest. Don't worry if the mixture
looks curdled like in the photo at left, it will smooth out when
it cooks.
Transfer the mixture to a heavy based saucepan and cook over low
heat until it looks smooth. Increase heat to medium and cook, stirring
constantly, until the mixture thickens, about 12-15 minutes. You
will know its ready when it will leave a path on the back of a sppon
or register 170°F on a candy thermometer. Do not let the mixture
boil!
Transfer cooked curd to a bowl and press plastic wrap on the surface
to keep a skin from forming. The curd will thicken as it cook, so
chill completely in the refrigerator. It should last for about a
week, covered tightly, in the refrigerator.
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