Place the frozen pineapple chunks, pineapple juice, and coconut milk into a high-powered blender.

Blend on high speed, using the tamper to push the frozen fruit down into the blades. If you do not have a tamper, stop the blender periodically to scrape down the sides.

Continue blending until the mixture is thick, creamy, and smooth, ensuring no large chunks of pineapple remain.

For a firm soft-serve texture, you can place the blender container in the freezer for 15-20 minutes before serving.

Transfer the mixture to a piping bag with a star tip and swirl into cups, or simply scoop and serve immediately.