Heat 4 cups of water until it reaches a boil in a kettle or on the stove.
Once the water is boiling, add the sugar and stir until it dissolves. Add the tea bags and let them steep for about 5-10 minutes, depending on your personal preference for strength.
After steeping, carefully remove the tea bags. Avoid squeezing them to prevent releasing bitter tannins.
Add the remaining water and allow the tea to come to room temperature. For faster cooling, place the pitcher in the refrigerator.
Fill glasses with ice cubes. Pour the cooled tea over the ice and garnish with lemon slices, mint leaves, or fresh fruit if desired.