Wash the blueberries, then combine them with the sugar and lemon juice in a saucepan. Cook over medium heat for 5-7 minutes, or until the blueberries release their juices and soften.
Blend the cooked blueberries until smooth, then strain through a fine-mesh sieve to remove the seeds and skins.
In a separate bowl, combine the heavy cream, milk, and vanilla extract. Add the blueberry puree and mix well.
Allow the mixture to cool completely to room temperature.
Pour the mixture into an ice cream maker and churn according to the manufacturer's instructions. If you don't have an ice cream maker, pour the mixture into a freezer-safe container and stir every hour during freezing.
Freeze for at least 4 hours, or until firm. Let stand at room temperature for a few minutes before serving.
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