01 - Combine diced pineapple, granulated sugar, and lemon juice in a saucepan. Cook over medium heat for 5 minutes, stirring occasionally, until pineapple softens and the sugar is dissolved. Allow the mixture to cool to room temperature.
02 - Transfer the 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 fully blended.
04 - Gently stir the pineapple puree into the cream mixture until thoroughly combined.
05 - Cover the bowl with plastic wrap or a lid and refrigerate for at least 2 hours to thoroughly chill the mixture.
06 - Pour the chilled mixture into an ice cream maker. Churn according to manufacturer's instructions, typically 20–30 minutes, until the texture is thick and creamy.
07 - Transfer the churned ice cream into a freezer-safe container. Cover and freeze for a minimum of 4 hours or until firm.
08 - Remove the ice cream from the freezer and allow it to sit at room temperature for 5 minutes before scooping and serving.