The key to a good espresso is for water, not harsh steam, to be forced through the coffee to preserve the delicate flavor without burning it. The result is not excessively bitter and features the desired fine ‘crema’ layer on the top. Typically this is done via an electric pump - all very well for a large commercial machine but for a home unit, moved frequently and built to be light, the number of moving parts can present reliability problems. This is what makes the manually operated Presso mechanism a very sensible option.
The mechanism can be compared to the ‘coffee plunger’ or ‘French press’ (designs that have also undergone innovative revamps in recent years) with the difference being that instead of moving the grounds down through the water, Presso is similar in function to a commercial espresso machine. Heated water for this unit is drawn from an exterior source meaning no internal boiler is required – this increases the longevity of the machine as such boilers are prone to tainting over time but on the downside, you still need to get the hot water from somewhere.
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