- Using a sharp chef's knife, chip the top and the bottom of the pineapple off. 
- Trim the outside skin off the pineapple carefully. 
- Use a potato peeler to remove any of the hard eyes. 
- Cut the pineapple in half lengthwise and then in half again. 
- Use your knife to cut out the core of the pineapple. 
- Dice the pineapple into chunks and freeze them (at least 6 hours or overnight). 
- Dice your banana and freeze those pieces as well. 
- Place your frozen pineapple, banana, coconut milk and lime into a blender. 
- Blend until smooth 
- This will make a smoothie consistency Dole whip, if you want it pipe-able then you can add this mixture to an ice cream machine as I did with my Bosch ice cream bowl attachment.  
- Or you place the mixture onto a sheet pan and freeze it for 15 minutes, mix with a whisk and freeze again. Keep doing this until it's thick enough to pipe.