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