Espresso machines have no match on chilly, outdoor evenings
There can be no better sight than brightly lit espresso machines serving
steaming coffee on chilly, wintry evenings. These machines brew coffee by
forcing hot water under high pressure through finely ground coffee. This
coffee has a different flavor to the filter coffee, and much of the
credit for this goes to the way the machine is designed.
A typical espresso machine consists of the following parts:
-- A reservoir that holds cold water to make coffee. The reservoir is not
welded to the machine and can be removed for cleaning.
-- A pump that pumps water stored in the reservoir into the heating
chamber at high pressure.
-- A heating chamber which is a sturdy, stainless-steel structure with a
heating element built into a groove in the bottom. The heating element is
a coiled wire, very similar to the filament of a light bulb or the
element in an electric toaster, which gets hot when electricity passes
-- A porta-filter which holds the ground coffee. Inside the filter is a
small removable screen into which the ground coffee is packed. On the
bottom of the filter are two spouts from where the espresso comes out
-- A steam wand which is used to heat and froth milk for use in various
espresso drinks. This wand is connected to the heating vessel. When the
user puts the valve in the steam position, steam from the heating vessel
is released out of the wand and into the milk
-- A control panel which comprises of an on/off switch, two indicator
lights and a control valve. One of the lights indicates that the machine
is on, and the other indicates if the temperature in the heating chamber
is right or not
You need to make sure that the water is heated to the right temperature,
the pressure is right for frothing, the coffee is packed in the right
density and the milk is hot before running the machine.