Original & Best. Sparkling Flavoured Soft Drink. The original IRN-BRU soft drink. BRU'd In Scotland Since 1901 To A Secret Recipe Of 32 Flavours With A Spirit That's As Bold As Its Taste. You Can't Describe It, Because There's Nothing Like It.The original IRN-BRU soft drink. The Strong Soft Drink An indescribable brand with a phenomenal taste. Throughout the years, IRN-BRU's irreverent and humorous advertising has continued to entertain and refresh fans up and down the country.