01 - Combine blueberries, sugar, and water in a small saucepan. Simmer over medium heat for 3 to 4 minutes, stirring occasionally, until the blueberries burst and the mixture thickens slightly. Strain through a fine-mesh sieve into a bowl, pressing the berries to extract all the liquid. Discard the solids and let the syrup cool.
02 - Pour boiling water over the black tea bags and steep for 3 to 4 minutes. Remove the bags and let the tea cool to room temperature.
03 - Combine the cooled tea, milk, blueberry syrup, and honey in a shaker or large glass. Stir or shake until well blended.
04 - Divide the ice cubes between two tall glasses. Pour the blueberry milk tea mixture over the ice and stir gently.
05 - Top with fresh blueberries and mint leaves if desired. Serve immediately.