01 - Bring 4 cups of water to a rolling boil in a medium saucepan. Add the black tapioca pearls and stir gently to prevent sticking. Cook for 20 to 30 minutes, or until the pearls are tender and chewy throughout. Remove from heat, drain through a fine mesh strainer, and rinse under cold running water. Set aside.
02 - Place the diced mango, sugar, whole milk, water, and lime juice into a blender. Blend on high until completely smooth and no chunks remain. Taste and adjust sweetness as desired.
03 - Divide the cooked tapioca pearls evenly between two large glasses. Fill each glass with ice cubes. Pour the mango milk blend over the pearls and ice, dividing it equally between the two glasses. Drizzle 1 to 2 tablespoons of sweetened condensed milk over each glass for extra creaminess.
04 - Stir each glass gently to combine all layers. Serve immediately with wide boba straws to enjoy the tapioca pearls.