The key to making frozen Vietnamese coffee is achieving a slush consistency. Pour your brewed coffee into a glass baking dish, mix in some sugar, and place it in your freezer.
When you remove the coffee from the freezer, use a fork to scrape it into smaller pieces. You can also break them up by putting them in a blender or food processor.
Once it's blended and you're ready to enjoy this treat, scoop the shaved coffee into a bowl or glass, crack open a can of sweetened condensed milk, and drizzle it over the coffee.