Boil 1 cup of water. Steep the 2 tea bags for 3 minutes, then remove them. Stir in 2 tablespoons of honey until fully dissolved. Set aside and let the tea cool completely.
Cut the mango into pieces and add to a blender with the remaining 1/2 cup of water. Blend until smooth.
Strain the blended mango through a fine mesh sieve into a bowl, pressing with a spoon to extract all the nectar. Discard the pulp.
Fill two glasses with ice. Pour the cooled honey tea into each glass until about two-thirds full.
Slowly pour the mango nectar over the top of the tea to create a beautiful layered effect.
Garnish with a fresh mango slice on the rim and serve immediately.