Peel bananas and cut in rounds. Place on cookie sheet and freeze. Put the frozen fruit in a food processor and using the steel blade process while slowly adding the liquid. You may use more or less liquid as you desire. Less liquid gives you a soft serve consistency, and more gets you a shake. Try using combinations of other frozen fruits for variety. This is best when used right away. Always thaw before serving if you have left overs. If you keep a supply of frozen fruit on hand, you can make this treat on a moments notice.