The Vietnamese coffee filter, known as a 'phin,' is a traditional brewing device used widely in Vietnam to prepare coffee. Typically made of stainless steel, the filter consists of a round brewing chamber with tiny holes and a lid to hold the coffee grounds in place. It sits atop a cup or glass, allowing hot water to drip slowly through the coffee grounds, extracting rich flavors over several minutes. The phin filter holds around 2-3 tablespoons of coffee, perfect for a single serving. This brewing method is renowned for producing a strong and aromatic cup of coffee, often enjoyed with sweetened condensed milk.