In a small saucepan, combine equal parts sugar and water. Bring to a gentle boil over medium heat, stirring frequently, and allow to boil for about 10 minutes until the syrup is clear and slightly thickened. Remove from heat and let cool.

In a blender, add the ripe bananas and freshly squeezed orange juice. Blend on high for about 3 minutes until completely smooth and creamy.

In a large, airtight container, pour in your cooled simple syrup followed by the banana-orange blend. Add the pineapple juice and lemon juice. Stir well until thoroughly mixed.

Seal the container tightly and place it in the freezer for at least 12 hours.

Once frozen, scoop about ½ cup of the slush into a glass. Top with lemon-lime soda and enjoy!