The Optimum Extraction; Tips For Texturing Milk - Gastroback DESIGN ESPRESSO MACHINE BASIC Operating Instructions Manual

• Ensure that the rim of the filter basket and Portafilter are completely clean and
dry, before installing the portafilter at the group head. Otherwise, the water may
flow out at the exterior of the portafilter. Wipe off any surplus coffee powder,
using a clean, dry cloth or kitchen towel.

THE OPTIMUM EXTRACTION

The taste and consistency of your espresso depends on the type, freshness, grind
size, storage of the coffee powder, filling level of the filter basket, and water quality.
Additionally, the pressure applied for tamping the coffee powder will have a great
influence on the taste and consistency of the results.
• The extraction time is an essential parameter influencing the taste and consisten-
cy of the coffee. It is a result of the amount of coffee powder, tamping pressure,
and grind size. Try to get a total extraction time of 20 - 40 seconds.
• It is better to add hot water after the extraction than increasing the extraction time.
• If your espresso does not meet your requirements, you should only change one
of the essential parameters mentioned above at a time. Then check, if you have
got closer to your favourite taste. This way, you will succeed step by step.
Only use completely heat-resistant vessels (e.g. cups, glasses, and mugs).
•
Ensure that your vessels will not melt or crack.
• Long Black is almost equal to "normal" coffee, and is prepared by adding hot
water (see: 'Hot Water'). Adjust the taste and flavour via the amounts: coffee
powder, espresso, and hot water.

TIPS FOR TEXTURING MILK

When texturing milk (e.g. for latte or cappuccino), you should avoid using
•
glasses or plastic vessels, because even heat-resistant glass and plastic could
crack or melt due to the extreme local heating during texturing.
• Porcelain (china) only poorly conducts heat. Thus, the milk inside may have a
significantly higher temperature than the exterior of a porcelain vessel.
• For a good temperature control, use metal vessels for frothing (e.g. the provided milk
jug). In this case, the optimum temperature is reached, when the exterior of the jug
becomes too hot to touch (approx. 60°C). Prefer to use the provided milk jug.
• While generating steam, the temperature of the water system decreases gradual-
ly. When the reading at the temperature gauge drops below 100°C (espresso
icon), you should switch off the steam function for a while. Wait until the tempe-
rature raised again and the yellow steam indicator illuminates again.
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