Measure out the condensed milk into a heat-resistant jar or glass.
Make the Vietnamese coffee by placing ground coffee (about 2 heaped tablespoons) into a metal phin and pour hot water over top.
Note: the amount of water that a single-serve phin can hold is about 4 oz, or half a cup. Once the initial water has stopped dripping, you will pour in a second round of hot water through the phin to make 8 oz (1 cup) of coffee.
Stir the coffee with the condensed milk and let it cool.
Note: If you use a silicone popsicle mold, be sure to insert the popsicle stick first prior to pouring in the coffee.
To make the popsicles, pour the cooled coffee into popsicle molds, stick in a wooden popsicle stick and freeze overnight.