Indian filter coffee is a coffee drink made by mixing frothed and boiled milk with the decoction obtained by brewing finely ground coffee powder in a traditional Indian filter. The drink known as Kaapi, is the South Indian phonetic rendering of "coffee". The drink is also referred to as Mysore filter coffee, Kumbakonam degree coffee, Mylapore filter coffee or Madras kaapi. Outside of India the term "filter coffee" may refer to drip brew coffee, which is a distinct form of preparing coffee.
The most commonly used coffee beans are arabica and robusta. These are grown in different states of South India, such as in the hills of Karnataka (Kodagu, Chikkamagalur and Hassan), Tamil Nadu (Nilgiris District, Yercaud and Kodaikanal), Kerala (Malabar region) and Andhra Pradesh (Araku Valley). The beans are usually medium-roasted and finely ground and blended with roasted chicory. The final coffee powder composition usually varies between 20 and 30 percent chicory, producing a distinct aroma and colour in the resulting coffee.
South Indian filter coffee is brewed with a metal device that resembles two cylindrical cups, one of which has a pierced bottom that nests into the top of the "tumbler" cup, leaving ample room underneath to receive the brewed coffee. The upper cup has two removable parts: a pierced pressing disc with a central stem handle and a covering lid. (A similar device is used to brew Vietnamese coffee.)
The upper cup is loaded with freshly ground coffee. The grounds are then compressed (i.e., tamped) with the stemmed disc into a uniform layer across the cup's pierced bottom. The coarser the coffee grinds, the more one has to tamp the coffee to retain the same extraction. With the press disc left in place, the upper cup is nested into the top of the tumbler and boiling water is poured inside. The lid is placed on top, and the device is left to slowly drip the brewed coffee into the bottom. The chicory holds on to the hot water a little longer, letting the water dissolve and extract more of the coffee grinds.