A method for treating citrus peel by processing pieces of raw citrus peel through a plurality of progressive, continuous clean steaming and mechanical pressing stages; rupturing at least some of the cells of the pieces of raw citrus peel to release liquid, sugar and oil bound within the pieces of raw citrus peel; and transforming the pieces of raw citrus peel into press cake and pressate. The clean steaming step ay involve using clean steam that is free of chemical water treatment additives.