Also known as red bush tea, rooibos (pronounced "roy-bus") is a mineral-rich and highly antioxidant herbal beverage from south africa. naturally caffeine-free, its flavor is somewhat similar to black tea, though very low in tannins so it doesn’t turn bitter if steeped for too long. rooibos is characteristically mild and aromatic with a slightly citric sweetness and is excellent hot or iced. this herbal tisane can also stand up to milk or sugar.