01 - Combine blueberries, sugar, and water in a small saucepan. Simmer over medium heat for 3–4 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 liquid. Discard solids and let the syrup cool.
02 - Pour boiling water over the black tea bags and steep for 3–4 minutes. Remove the bags and let the tea cool to room temperature.
03 - In a shaker or large glass, combine the cooled tea, milk, blueberry syrup, and honey if using. Stir or shake until well mixed.
04 - Divide ice cubes between two tall glasses. Pour in the blueberry milk tea mixture and stir gently.
05 - Garnish with fresh blueberries and mint leaves if desired. Serve immediately.