Measure out 3/4 cup of milk. Pour into the bottom of the food processor. If you don't have a food processor, a high-speed blender will still do the trick with extra blending time.
Roughly slice large chunks of fresh pineapple and place in the food processor.
Peel and mash 1 whole banana. Place in food processor.
Blend in food processor until ingredients are combined and no large pineapple chunks remain. Once the pineapple chunks are gone you have found the right consistency.
Serve within 24 hours for best results and taste. Place in an airtight container and chill in the refrigerator.