Sumatra Mandheling Coffee is a rare Indonesian coffee that is delightfully smooth with a rich, heavy body, low acidity, exotic flavor with an intense syrupy aftertaste, and earthy richness. Sumatra Mandheling Coffee is a rare Indonesian coffee that is delightfully smooth with a rich, heavy body, low acidity, exotic flavor with an intense syrupy aftertaste, and earthy richness.Light Dark. From the sub-region of Lake Takengon, Sumatra Mandheling is a wet-hulled coffee that provides your coffee cup with a heavy and complex body. Medium-roasted to perfection, Mandheling coffee is layered with flavors such as dark chocolate, floral herbs, and hints of mangoes and peach.