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In a small glass or plastic bowl, whisk lemon juice into beaten egg yolks, and set aside.
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In a medium saucepan over medium heat, combine buttermilk, heavy cream, sugar, lemon zest, and salt, and stir until the sugar is dissolved.
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Continue to heat, stirring regularly, until mixture just comes to a boil.
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Remove from heat, and vigorously whisk 1 cup of cream mixture into egg mixture to temper.
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Return pan to heat, and slowly pour the egg mixture into cream mixture, again whisking vigorously.
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Bring to a boil, and cook, whisking constantly, until mixture thickens enough to coat the back of a spoon.
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Strain the mixture into a bowl, press plastic wrap down onto surface to prevent a skin from forming, and refrigerate overnight.
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Stir chilled mixture, transfer to ice cream freezer, and freeze according to manufacturers directions.
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Transfer ice cream to a covered container, and freeze for 4-6 hours.