Bring 1 cup water to a boil in a saucepan. Remove from heat and add sugar; stir until dissolved. Add tea bags and steep 4 minutes.Advertisement
Remove bags; press gently to release liquid, then discard. Let cool completely. Refrigerate until cold.
Blend mixture with lemon juice and watermelon cubes until smooth. Serve, with watermelon slices.
If you prefer loose tea: Use one teaspoon loose tea for each tea bag.