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Coffea Arabica
Source: Köhler's Medizinal-Pflanzen in naturgetreuen Abbildungen mit kurz erläuterndem Texte,
Franz Eugen Köhler, 1887.
Mokka Coffee Pot
A: Bottom chamber which contains water. When the pot is heated on a stove, pressure from the steam pushes the water through B (Basket containing ground coffee) and into C (Collecting chamber for coffee)
D: Filter
E: Rubber ring that keeps the filter in place
How to prepare a coffee with the traditional coffee maker:
Remove the filter (D) and pour water in chamber A up to the small metal button you see inside. Put the filter back in place and fill with ground coffee. Press the coffee slightly (do not press too hard, otherwise the waterdamp will not pass through the coffee ground). Screw the collecting chamber (C) back on and put the coffee maker on the stove. Do not leave the espresso pot heating for too long. You will hear the coffee bubbling out of the chimney inside the collecting chamber and this characteristic sound will change when the last drops are coming out. You can also check by lifting the lid of the espresso pot, when the drops are coming out more slowly the coffee is ready. Once the coffee is ready remove the espresso pot immediately from the stove, otherwise the coffee will get a burnt taste.
Some solutions to common problems:
The coffee has a burnt taste:
Either the espresso pot remained too long on the stove after the coffee was ready, or the coffee ground itself was roasted too dark. If the latter is the case, try medium-roasted coffee, which is best to make an Italian espresso.
The coffee is too strong:
Use less coffee.
The coffee looks ready (no more coffee is coming out of the chimney), but it is very strong and there is still water in the bottom of the chamber.
This means either that you pressed the coffee too much, or that you put too much coffee in the filter. In that case the waterdamp will not be able to percolate through the coffee ground. Use less coffee and press it a little less.
Another (very common) reason is that after a while the filters may become obstructed. Remove the rubber ring and the filter under it and clean both filters thoroughly with water. You may also use a needle the clear the holes of the filters. If necessary replace the internal filter (which is sold separately together with the rubber ring) by a new one.
While this is the true traditional way coffee is being prepared in Italy, espresso aficionados pretend this process does not produce sufficient pressure to make a true espresso, resulting in a lack of crema and none of the characteristic taste.
However, Italians themselves claim that the quality of their coffee ultimately depends on the purity of the water. So, unless you live in Naples (the Italian city where supposedly they make the best espresso), we suggest you use bottled instead of tap water.