- Our Black Raspberry Yerba Mate tea is a scrumptuous all-natural flavored Yerba Mate coffee substitute with Blackberry, Raspberries (Red) and Raspberry Leaf (Red) that will refresh you with its terrific taste! You will enjoy the earthy and acidity-free Black Raspberry aroma and flavor again and again! - Ingredients: Yerba Mate, Blackberry, Raspberries (Red), Raspberry Leaf (Red) and Natural Black Raspberry Flavor.