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COMBINE blueberries, sugar, and salt in a heavy saucepan.
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HEAT blueberry mixture over medium-high heat until sugar dissolves while STIRRING occasionally.
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CONTINUE HEATING blueberry mixture until it comes to a boil.
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REDUCE heat.
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SIMMER blueberry mixture for an additional 10 minutes.
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REMOVE blueberry mixture from heat.
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COOL for 20 minutes.
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PURÉE blueberry mixture in a blender.
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COMBINE blueberry mixture, heavy cream, milk, and lemon juice in a large bowl.
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COVER ice cream base with plastic wrap.
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CHILL ice cream base in refrigerator overnight.
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POUR ice cream base into an ice cream maker.
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PROCESS ice cream according to manufacturer's directions.