01 - Bring 2 cups of water to a rolling boil. Add the black tea bags or loose-leaf tea and steep for 5 minutes. Remove the tea bags or strain out the leaves. Set aside and allow the tea to cool to room temperature.
02 - Prepare the quick-cooking tapioca pearls according to the package directions. Once cooked, drain and rinse under cold running water to halt further cooking. Set aside.
03 - In a small saucepan, combine the blueberries, sugar, 2 tbsp water, and lemon juice. Simmer over medium heat for 5–7 minutes, stirring gently, until the berries have burst and the mixture has thickened. Mash the berries with a spoon, then press the mixture through a fine-mesh strainer to produce a smooth syrup. Discard the solids and let the syrup cool.
04 - Divide the cooked tapioca pearls evenly between two tall glasses. Fill each glass with ice cubes.
05 - Pour 2–3 tbsp of the blueberry syrup into each glass. Add half of the cooled brewed tea to each glass, followed by half of the cold milk. Stir gently to combine all the layers.
06 - Taste and adjust sweetness with honey or your preferred sweetener, if desired. Serve immediately with a wide boba straw.