True espresso must be made entirely from arabica beans, which have half the caffeine of the alternative robusta variety.

ECONOMIST: Espresso coffee

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.

BBC: A speciality coffee scene brews in Hong Kong

Stell traveled from Oregon to Atlanta, Georgia, for the Specialty Coffee Association of America expo, where the show floor was filled with nearly 800 booths featuring everything from exotic coffee beans to the latest Italian espresso machines.

CNN: High-end coffee business slows during recession