Add the frozen pineapple chunks, chilled coconut milk, and lime juice into your blender. If desired, include a splash of sweetener for extra sweetness.
Secure the lid and start blending on low speed, then gradually increase to high. Blend until the mixture is smooth and velvety, with no large chunks remaining—listen for a consistent whirling sound.
Check the texture; if it's too thick or icy, add a splash more coconut milk and blend again until you reach a creamy, slushie consistency.
Pour the blended mixture into glasses or bowls. The color should be vibrant and inviting, with a smooth surface on top.
If serving immediately, enjoy the slushie with a straw or spoon. For an even colder treat, place the glasses in the freezer for 10-15 minutes before serving to firm up slightly.