Add Ingredients: Place the frozen pineapple chunks, frozen banana, fresh lime juice, coconut milk, and maple syrup, if using, into the blender.
Blend: Start blending on low speed, gradually increasing to high, until the mixture becomes smooth and creamy. You may need to stop and scrape down the sides of the blender a few times to ensure all the ingredients are well incorporated.
Taste and Adjust: Taste the sorbet mixture and adjust the sweetness by adding more maple syrup if needed. Blend again briefly to combine.
Enjoy as a soft serve: Serve soft scooping into bowls, and garnish with fresh pineapple slices or a sprinkle of shredded coconut if desired.
Chill the Mixture: If the mixture has become warm during blending, transfer it to an airtight container and place it in the freezer for about 30 minutes to cool down. This step will help maintain the sorbet's texture.
Freeze: For a hard ice cream consistency, pour the sorbet mixture into a loaf pan (or freezer-friendly, airtight container) and place it in the freezer for 2 or 3 hours.
Serve: When ready to serve, allow the sorbet to sit at room temperature for a few minutes (around 20 minutes) to soften slightly. Scoop into bowls, and garnish with fresh pineapple slices or a sprinkle of shredded coconut if desired.