Put the desired amount of condensed milk into a glass.
Place the coffee phin over the glass.
Place 1 tablespoon of ground coffee inside the coffee phin.
Press the coffee phin disk onto the coffee ground.
Slowly pour enough boiling hot water to cover the coffee phin disk and wait for 20 seconds.
Pour more boiling water into the coffee phin. I usually pour enough boiling water until it reaches the top of the coffee phin.
Wait for the water to completely drain into the glass below.
When the coffee stops dripping, remove the coffee phin.
Stir the coffee and condensed milk until it's well mixed.
If consuming with ice, wait for the coffee and condensed milk to cool before adding crushed ice. Enjoy.