Thoroughly wash the red currants and remove them from their stems. Using an immersion blender or food processor, purée the currants, then strain them through a fine-mesh sieve to remove the seeds.
In a saucepan, combine the milk and heavy cream, and heat over medium heat until warmed through, but do not let it boil. Add the sugar and stir until completely dissolved.
Remove the saucepan from the heat and add the red currant purée, lemon juice, and vanilla extract. Stir well to ensure the flavors are evenly distributed.
Let the mixture cool completely, then refrigerate for at least 2 hours to chill thoroughly.
Pour the chilled ice cream base 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 with a fork every hour to prevent ice crystals from forming.
Before serving, let the ice cream stand at room temperature for a few minutes to soften slightly. Garnish with fresh red currants or mint leaves.
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