01 - Combine pineapple, granulated sugar, and lemon juice in a saucepan. Cook over medium heat for 5 minutes, stirring occasionally, until the pineapple softens and the sugar is fully dissolved. Remove from heat and allow to cool to room temperature.
02 - Transfer the cooled pineapple mixture to a blender or food processor and puree until completely smooth.
03 - In a large bowl, whisk together heavy cream, whole milk, vanilla extract, and salt until well combined. Stir in the pineapple puree until uniformly incorporated.
04 - Cover the bowl and refrigerate the mixture for at least 2 hours until thoroughly chilled.
05 - Pour the chilled mixture into an ice cream maker. Churn according to the manufacturer’s instructions, typically 20 to 30 minutes, until thickened to a creamy consistency.
06 - Transfer the churned ice cream to a freezer-safe container. Cover and freeze for at least 4 hours or until firm.
07 - Let the ice cream sit at room temperature for 5 minutes before scooping to serve.