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