Whisky Redbreast 15 Year Old. Made from a mash of malted and unmalted barley and then triple distilled in copper pot stills, Redbreast 15 is comprised exclusively of Pot Still whiskeys matured in the finest oak casks for no less than 15 years. A careful balance of first fill and refill casks accentuates the assorted spices within Redbreast’s characteristic full and complex flavour.