In a saucepan, bring 250 ml (1 cup) of water and the sugar to boil, stirring until the sugar has dissolved. Pour into a pitcher. Add the water, lemon juice, rum, lychee and syrup. Refrigerate for 4 hours or overnight.
Serve with ice.
Recipes with the \"Healthy Pick\" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.