Add the fresh pineapple, sugar, egg yolks and salt to the jar of a blender or food processor. Blend until smooth.
2 cups fresh pineapple, 1 cup granulated sugar, 4 egg yolks, ⅛ tsp salt
Place the heavy cream and milk in a 2 cup glass measuring cup. Set aside.
1 cup heavy whipping cream, 1 cup whole milk
Pour the pineapple mixture into a medium sauce pan and heat the sauce pan to medium-high heat and cook until the mixture heats to a low boil and is no longer foamy, stirring constantly with a rubber spatula.
Slowly pour the heavy cream/milk mixture into the pineapple mixture, whisking constantly as you pour so the eggs don't curdle. Stir until thoroughly mixed into one consistent color.
Place a strainer over a medium glass mixing bowl or 4 cup glass measuring cup. Pour the custard through the strainer into the bowl/cup to strain out any egg particles that may have curdled and pineapple seeds or fibers. Add the lemon juice. Taste and add more if desired.
1 tbsp fresh lemon juice
Cover the bowl/measuring cup with plastic wrap and refrigerate overnight or until the mixture is approximately 40 degrees F.
The mixture will thicken slightly. Pour into the bowl of an ice cream maker and process according to manufacturer's instructions.
Place the ice cream into freezer-safe containers and freeze for at least 4 hours or overnight to allow the ice cream to become firm and the flavors to meld together.
Yields about 1 quart of ice cream, depending on how cold your ice cream maker is and how long you churn it. I have both a Kitchen Aid ice cream attachment and a Cuisinart stand alone ice cream maker. Typically, it takes 20-25 minutes for my ice cream to be soft serve set in either unit.