The art of roasting
Before coffee beans work their delicious, aromatic liquid magic on our palates, they must undergo a serious transformation: roasting, blending, grinding and, finally, the preparation of the drink. Let's take a look at this process that results in a cup of hot, fragrant, beautifully colored coffee. With the arrival of
industrialization and its contiued positive evolution, the roasting stage came to be considered an "arte sublime"--a sublime art--to be handled primarily by professional roasters. In our century, roasters have at their fingertips advanced technology that enables them to complete the entire roasting cycle in minutes while producing a high-quality product. In these new machines, coffee beans pass from hoppers into a roasting cylinder
that rotates on its own axis. In this way, the coffee beans are constantly being mixed thus guaranteeing uniform roasting. The most important person involved in this process, of course, is the master roaster, a true "maestro", whose experience and care come into play as he draws forth samples from time to time to check that the beans are being roasted correctly, according to his recipe. The best temperature for roasting is between 200░C. and 240░C. (392░F.-464░F.) at which point the beans begin to crack and a series of mysterious transformations start to take place. The most important changes are the following: The decomposition of certain substances results in the formation of other substances that give coffee its typical taste and strongest aromas, freeing the beans' essential oils. Laboratory analyses have revealed that roasted coffee contains more than 300 different aromas. In addition, during the roasting, coffee gains from 25% to 35% in volume while its weight decreases from 18% to 22%. Roasted beans become brittle and water soluble. The quantity of caffein, on the other hand, doesn't change much other than becoming more soluble in roasted beans. Once the
temperature reaches 220░C.-230░C. (428░F.-446░F.), it is necessary to take the coffee out of the heat for the cooling process which must be fast. In modern plants, roasted beans are cooled with air blasts during which volatile aromatic substances condense, remaining sealed within the shell until they are ground and transformed into a cup of coffee.
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