Remove from heat and add limemade concentrate, stir until combined and dissolved.
Cool to room temperature or just warm.
Transfer to a large freezer safe container and freeze until firm, about 6-8 hours. I like to divide it amongst 2 tupperware containers.
To serve: scrape the frozen “juice” into a pitcher and add a 2 liter bottle of CHERRY 7-UP.
Alternatively, you can scrape the frozen slush into cups or a small pitcher and add as much 7-UP as you see fit. Taste as you go, this is how I prefer to do it! If i want it more slushy I add less soda and vice versa.