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 sugar is fully dissolved. Allow 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 thoroughly combined. Stir in the pineapple puree.
04 - Cover the bowl and refrigerate the mixture for a minimum of 2 hours until thoroughly chilled.
05 - Pour the chilled mixture into an ice cream maker and churn according to the manufacturer's directions, typically for 20 to 30 minutes, until the texture is thick and creamy.
06 - Transfer churned ice cream to a freezer-safe container. Cover securely and freeze for at least 4 hours until firm.
07 - Allow ice cream to rest at room temperature for about 5 minutes to soften slightly before scooping and serving.