Pour water, sugar, mango, and ginger into a saucepan over medium high heat. Stir until sugar dissolves. As mango and ginger softens, smash pieces against the side of the pan to release more flavors. Simmer for 8-10 minutes. Remove from heat and strain. Set aside to cool.
Steep tea bags in hot water for 5 minutes. Remove tea bags and pour tea over ice.
Stir in mango syrup and lemon juice. Serve with fresh mint leaves.
Substitute mango for pineapple, guava, or peaches.
For a "hard" sweet tea, add 1 oz. of dark rum.