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In small heavy saucepan, heat milk to 175 degrees; stir in sugar until dissolved.
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Whisk a small amount of hot mixture into egg yolks.
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Return all to the pan, whisking constantly.
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Add lemon peel.
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Cook and stir over low heat until mixture reaches at least 160 degrees and coats the back of a metal spoon.
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Remove from heat; strain.
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Stir in lemon juice.
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Cool quickly by placing pan in a bowl of ice water; stir for 2 minutes.
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Stir in cream.
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Cover and 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.
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Refrigerate remaining mixture until ready to freeze.
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Transfer to a freezer container; freeze for 2-4 hours before serving.