Presso is an internationally patented, manually operated lever action espresso machine. Designed by P Hunt from Therefore in the United Kingdom. In 2004 it received design awards in the UK.
The body of the Presso is made from hand polished, pressure cast aluminium. Stress bearing components are made from stainless steel. A heat-proof, tough transparent plastic reservoir receives boiling water. The portafilter is a domestic sized(50mm)commercial style, chrome plated unit. The lever action is reminiscent of the ladies legs cork screw. The shower and patented one-way valve are made from food grade silicone.
Adjustments to the three main components of your pour (grind, dose and tamp) will change the body, flavour and consistency of the shot produced. An optimum extraction for espresso is popularly accepted as 25sec.
Grind: a grind that is too fine will produce a longer extraction time. Conversely a grind that is too coarse will reduce the extraction time.
Dose: overfilling and underfilling the filterbasket will affect crema and extraction time.
Tamp: pressure on the tamp or lack there of will affect the even penetration of the puck by water at sufficient pressure.
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