Vietnamese coffee is traditionally made with a small metal drip filter, called a phin. The coffee grounds and hot water are placed in the phin, which is then placed over a cup or mug. The hot water drips through the coffee grounds, and the resulting coffee is strong and often sweetened with condensed milk. To make Vietnamese coffee with an aeropress, simply brew your coffee as you normally would using the aeropress. Once brewed, add in sweetened condensed milk to taste. You can also add some ice if you like iced coffee.