01 - Combine pineapple, sugar, and lemon juice in a saucepan. Cook over medium heat for 5 minutes, stirring occasionally, until pineapple softens and sugar fully dissolves. Remove from heat and allow to cool to room temperature.
02 - Transfer cooled pineapple mixture to a blender or food processor. Blend until completely smooth.
03 - In a large bowl, whisk together heavy cream, whole milk, vanilla extract, and salt until thoroughly combined.
04 - Stir pineapple puree into the cream mixture until fully blended.
05 - Cover the bowl and refrigerate the combined mixture for at least 2 hours to ensure proper chilling.
06 - Pour chilled mixture into an ice cream maker and churn according to manufacturer instructions, generally 20 to 30 minutes, until thick and creamy.
07 - Transfer churned ice cream to a freezer-safe container, cover, and freeze for at least 4 hours or until set to a firm consistency.
08 - Allow ice cream to sit at room temperature for 5 minutes before scooping and serving.