In a blender, combine bananas, sugar and 1 cup water and blend until smooth.

Pour into a large container.  Add 4 cups water, pineapple juice, orange juice concentrate and lemonade concentrate and mix until well combined.

Freeze until solid.  This takes at least 2 days, so you need to plan ahead.  Take out of the freezer 3-4 hours prior to serving, and when ready to serve, break up with a potato masher until it’s still very chunky, and just starting to get slushy.  Pour into a large punchbowl and add gingerale.  Mix and serve.