Milk Tea: In a small saucepan, over medium-high heat the milk and brown sugar until simmer. Turn off heat and steep black tea for 20 minutes. Pour into a large bowl or cup and refrigerate until chilled.
Boba: In a small saucepan, boil six cups of water. Add boba and stir until the boba floats to the top. Turn down the heat and simmer for 25 minutes stirring occasionally. Then turn off the heat and let the boba sit on the stove for 25 minutes, stir occasionally. Then drain the boba.
Steep boba in brown sugar bath. In a small heatproof bowl, add 1/2 cup brown sugar, 1/2 granulated sugar, and 1/2 cup boiling water and mix. Add the cooked boba and let steep the boba for 25 minutes.
Cook the caramelized brown sugar syrup: In one small saucepan pour in 1 cup granulated sugar and 1/2 cup water and whisk until sugar is dissolved. Then turn on medium-high heat until it begins to boil. Then turn down the heat to medium and let it simmer until the sugar water is caramelized and turns brown about 15-20 minutes. DO NOT WHISK. Frequently lift up the saucepan and swirl the mixture so it doesn’t burn.
In the meantime, in a second saucepan, boil the 1/2 cup of water. When the water boils, turn off the heat and immediately mix in the 1 cup brown sugar until dissolved. Set aside.
When the white sugar pan is caramelized, add the brown sugar mixture into the white sugar saucepan and quickly whisk. Simmer for 5 minutes and then turn off the heat to cool.
Serve. Line the outside of the cup with the syrup, add the boba, ice, milk tea, add in 1-2 tbsp of the brown sugar boba bath to taste and enjoy!