What flavour is portello? Rich and luscious, Billson's Portello Cordial follows an original fruity cola recipe. Its unique grape and berry taste and pinkish/purplish colour is reminiscent of the forever loved Creaming Soda. Brewed with pure Alpine Spring Water, Billsons cordial is easily enjoyed with still or soda water or as the star ingredient in your amazing cocktail or cooking creations.