Brew the Tea: Boil 2 cups of water and pour into a heat-proof pitcher. Add the tea bags and allow them to steep for 10 minutes before removing.
Prepare the Mango Puree: As the tea steeps, place the peeled, diced mango and the other 2 cups of water into a saucepan. Bring the contents to a boil.
Simmer and Mash: Lower the heat and let the mango simmer for about 10 minutes until very soft. Gently mash the mango pieces with a spoon or masher to break them down.
Strain and Sweeten: Pour the hot mango mixture through a fine-mesh sieve directly into the tea pitcher, pressing the pulp to extract all the juice. Stir in the honey until it fully dissolves.
Chill and Serve: Let the tea cool to room temperature, then refrigerate for at least 2 hours. Serve over ice, garnished with fresh mango slices if desired.