At Matchacha Seoul in Seongsu-dong, owner Lee Yenie can be found behind the counter, vigorously whisking pulverized green tea leaves into a frothy, creamy beverage. “I have a fondness for matcha,” said Lee, 29, of why she decided to specialize in beverages crafted from the powdered green tea. Considered by many health-conscious consumers to be a wholesome caffeine fix, matcha has been gaining traction around the world. For traditional ceremonial-style matcha, owner Lee Yeni sifts ceremonial grad