- Our Black Walnut Sumatra coffee is a delicious, all-natural, full-bodied complex flavored Sumatra coffee blended with Black Walnut Leaf, Walnuts and Rose Petals. You will enjoy the marvelous Black Walnut flavor and the intense Sumatra coffee taste! - Ingredients: Sumatra coffee (whole coffee beans), Black Walnut Leaf, Walnuts, Rose Petals and Natural Black Walnut Flavor.