01 - Combine diced pineapple, granulated sugar, and lemon juice in a saucepan. Place over medium heat and cook for 5 minutes until pineapple is softened and sugar fully dissolves. Remove from heat and allow the 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 mixing bowl, whisk together heavy cream, whole milk, vanilla extract, and salt until fully combined. Gently fold in the pineapple puree.
04 - Cover the mixture and refrigerate for a minimum of 2 hours until thoroughly chilled.
05 - Pour the cold mixture into an ice cream maker. Churn according to the manufacturer's instructions, typically for 20 to 30 minutes, until the consistency is thick and creamy.
06 - Transfer the churned ice cream to a freezer-safe container, cover tightly, and freeze at least 4 hours until firm.
07 - Allow ice cream to sit at room temperature for 5 minutes before scooping. Serve immediately.