Add pineapple and milk to a blender (you want something powerful like a Blentec or Vitamix) and blend on high speed until pineapple mixture is smooth. If your pineapple isn't sweet enough, you may need to add 1-2 tbsp sugar.
Scoop out and eat immediately. You can also put in through an ice cream maker for a firmer texture.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.