Combine water and sugar in a small saucepan, bring to a boil and cook over medium heat until sugar dissolves, about 5 minutes. Remove from fire and cool.
Peel the mango and cut the flesh from the pit. Grind the mango into a puree. Mix puree, lime juice and sugar syrup.
Pour the mixture into a container and refrigerate for at least 3 hours. Every 30 minutes. Take the container out of the refrigerator and stir the mixture with a whisk.