Design and Function The Moka Pot is built up of three pieces.  There is the boiler or lower chamber (A) where water is poured . Then there is the funnel-shaped cylinder (B) in which the grinded coffee powder is inserted. There is also the upper part (C) with the pipe. The upper part contains the fresh brewed coffee after the boiling process. In brewing coffee, you fill the boiler (A) with water and insert coffee powder in the funnel shaped cylinder (B). You place the Moka pot on a hot stove and wait... The water is heated up and will start to boil. When the water is brought to the boiling point, it starts to create steam in the boiler. Through the steam, there is an abundance of pressure in the boiler that forces the hot water through the coffee powder through the cylinder.  The espresso (or should I say, the Moka ;-)), is forced through the pipe into the upper chamber (C). The upper part finally collects the fresh Moka. Once the boiler (A) is almost empty, a gugly noise "rrchhhhsch" occurs due to trapped water that is left over in the boiler (A). Once you hear this gugly noise, you know that your coffee is done. Now is the time to remove the Moka pot from the stove. Otherwise your coffe might taste bitter... you don´t want that!                                                                                                                                                                                                                                                www.wikipedia.org/wiki/Espressokanne