- Our Black Walnut Colombian Decaf coffee is a tasty, naturally flavored, medium-bodied decaffeinated Colombian coffee with Black Walnut Leaf, Walnuts and Rose Petals. You will enjoy the Black Walnut flavor and mild, less-acidic Colombian coffee taste! - Ingredients: Decaffeinated Colombian coffee (whole coffee beans), Black Walnut Leaf, Walnuts, Rose Petals and Natural Black Walnut Flavor.