In the UK last month shares in coffee roasting company Coburg Group suddenly rocketed after an anonymous tipster suggested it was about to transform into an internet concern.
But without roasting coffee themselves the common consumer would not understand that there is a different roasting time for each different coffee bean, like there is a different cooking time for chicken vs. pork.
It is quite normal for a fair quality batch of green coffee (that is, coffee before roasting) to be 1-2% defective.
Roasting coffee depends on different characteristics of the bean, density, shape, growing region..all these factors decide how dark or light the roast should be.
Other local coffee roasters include Coffee Assembly, a pioneer that began roasting in 2006, and Glory Coffee and Fahrenheit 500, both of which supply roasted beans for 18 Grams and Espresso Alchemy.
Since 1971, Starbucks Coffee Company has been committed to ethically sourcing and roasting the highest-quality arabica coffee in the world.
Good baristas are expected to know in detail the process of coffee-making from cultivation and harvesting to roasting, blending and brewing.
In Costa Rica, Jose Antonio Vera, head of sales and exports for Coopronaranjo, a cooperative with 2, 000 producers, said that in recent years it has launched two supermarkets and a roasting mill where producers can grind their own coffee and sell at a greater value than their beans.
When Tam is not roasting his beans himself, he relies on local micro-roaster Fresh Coffee and Tea (based in North Point) for top-quality beans.
The roasting must be even, and the grinding process must be finely calibrated so that the resulting coffee allows smooth passage of the hot water that extracts the flavour.
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