In a large pitcher, combine 2 cups of freshly boiled water with the tea bags. Allow the tea to steep for approximately 10 minutes.
Concurrently, in a saucepan, heat the remaining 2 cups of water and the diced mango. Bring the mixture to a boil. Reduce the heat and gently simmer for about 10 minutes, continuously mashing the mango until it forms a smooth puree.
Strain the mango puree into the pitcher containing the steeped tea. Add the honey and stir thoroughly to combine.
Let the tea mixture cool completely. Serve chilled over ice, garnished with fresh mango slices.