Put the bag in a metal ring holder to hold it in a kettle. Add the black tea and pour the hot water (98 degrees C) overtop. Simmer the kettle on the stove for 10 minutes.
Once it has simmered, start the process of tea pulling by placing the sackcloth bag on top of another kettle and pour the tea over top. Then, place the bag on top of the other kettle and pour the tea over top. Repeat these steps once. In total, the tea will be pulled four times.
Return the tea to the stove and simmer it for 15 minutes or until rewarmed.
Shortcut way of using tea bags
Bring water to a boiling and then mix the tea bag and water; reduce the heat to a simmer and simmer it for 5 to 10 minutes. Remove the tea bag.
Assemble the coffee milk tea
Add iced cubes, condensed milk, evaporated milk, black tea and coffee one by one. Combine well before drinking.
Video
Notes
Note 1: you can use 250ml tea liquid from the Hong Kong style black tea