Imperial Kosher USDA Certified by QAI (Quality Assurance International) Pu-Erh is a tea that undergoes a period of aging. It is the most complex of Chinese teas. Traditionally all teas were fermented in the manner due to long travel times when they were being exported. In ancient time round cakes of these teas were used as currency. When brewed, Pu-Erh tea has a dark reddish color with a strong, full and earthy taste. Some scientific studies have suggested the possibility that Pu-Erh tea reduces cholesterol and blood fats.