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In a large saucepan, heat the cream and milk to 175°; stir in sugar until dissolved. Whisk a small amount of hot mixture into the eggs. Return all to the pan, whisking constantly.
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Cook and stir over low heat until mixture reaches at least 160° and coats the back of a metal spoon.
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Remove from the heat. Whisk in cream cheese until smooth. Cool quickly by placing pan in a bowl of ice water; stir for 2 minutes. Stir in lemon juice and vanilla. Press plastic wrap onto surface of custard. Refrigerate for several hours or overnight.
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Fill cylinder of ice cream freezer two-thirds full; freeze according to manufacturer’s directions. Refrigerate remaining mixture until ready to freeze. Transfer to a freezer container; freeze for 2-4 hours before serving. Yield: 1-1/2 quarts.