• ESPRESSO

    Espresso ( Austro roasters ) is a native of Milan Kaffeezubereitungsart is pressed in the hot water at high pressure through very finely ground coffee made ​​from dark roasted coffee beans.

    The procedure yields a concentrated coffee on which a dense hazel foam layer - the crema - is that contributes to its flavor .Due to the strong roast and a typical serving size of 25 ml of the caffeine content of a cup of espresso in total , although low in concentration but higher than that of a cup of filter coffee (typically 125 ml).Espresso is usually served in small, thick-walled and pre-warmed cups with about 40 ml capacity and sweetened or unsweetened drink .It is often served with a glass of water.

    Espresso is now the most common way of preparation for coffee in southern Europe , particularly in Italy , Spain, Portugal (where it simply café is, in Lisbon bica sl ) and France (where it is called expresso or petit noir ) .In these countries obtained for tourists often surprising , an espresso, if you coffee ( Italian: caffè, French , Spanish: and Portuguese: café , gr : καφές , Bulg : kaфe , Croat . Kava ​​)ordered.In Switzerland, espresso is usually prepared in German Switzerland as the most common espresso lungo (German : café crème or just coffee) , in western Switzerland as a normal espresso [ 1].

    Ultimately depends on the quality of an espresso not only on the mixing ratio.For the preparation of a good espresso are traditionally five criteria be met ( the 5 -M - formula [4 ] ) :

        
    The mixture - the selection of the coffee beans ,
            
    Quality of the beans
            
    Careful and appropriate to the beans roasting
            
    Freshness of the beans used
        
    The amount - the right amount of powder (usually 7 g) ,
        
    The grind - the right , not too coarse , not too fine grinding of beans,
        
    The machine - a good machine ,
            
    Temperature of the water
            
    Pressure of the water
            
    Quality (including hardness ) of the water
        
    The man - the maker of the drink.
            
    Soulful Tampern according to the degree of grinding ( = pressing of coffee grounds into the filter )
            
    Properly chosen ( thick-walled and preheated ) cup, because the espresso cools fast otherwise
            
    Coordination of all factors to each

    A simple to carry out quality test is the so-called " island test ": When sprinkling of sugar in the espresso itself must form only gradually goes down a " Sugar Island " .This is not the case, the coffee has a little cream or crema to low consistency .In general, an espresso , which is the island sample , obtained only from traditional espresso coffee machines , are therefore rarely used in Italy fully automatic .

    Also important for the quality of the pressing, the pressing of the ground coffee in the filter holder by means of a plunger-like " coffee tamper " ( Pressino ) .About the pressure there are different opinions : While many experts a pressure of 20 kg as the optimal and thus considered setpoint is , in many Italian bars, the coffee is only lightly pressed .So that the processing time in the above-mentionedapproximate 25 seconds is , however, the grind needs to be coarsened at greater pressure , more finely adjusted with less pressure.
    Typical amounts , temperatures, pressures, etc. [edit ]

    The Istituto Nazionale Espresso Italiano (German : National Institute of Italian Espresso ) has established the following criteria: [6 ]

        
    necessary amount of ground coffee = 7 g ± 0,5 g
        
    Water temperature at the outlet of the unit = 88 ° C ± 2 ° C
        
    Beverage temperature in the cup = 67 ° C ± 3 ° C
        
    Pressure water input = 9 bar ± 1 bar [5 ]
        
    Cycle time = 25 seconds ± 2.5 seconds
        
    Viscosity at 45 ° C> 1.5 mPa s
        
    Total fats > 2 mg / ml
        
    Caffeine <100 mg / cup
        
    Volume in the cup (including crema ) = 25 ml ± 2,5 ml

    A laboratory is the ideal preparation to as :

        
    Amount of coffee beans : 6.95 g
        
    Water temperature: 92 ° C
        
    Pressure water input: 9.3 bar
        
    Cycle time: 25 seconds

    Source: Wikipedia

     

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