Marmalade's a fruit preserve, in English usage made of citrus fruits. British-style marmalade's sweet marmalade with a bitter tang made from fruit, sugar, water, and zest, which contains the bitter orange oil. Some commercial brands add a gelling agent. American-style marmalade's sweet, not bitter. In English-speaking usage "marmalade" mostly refers to a preserve derived from a citrus fruit, commonly oranges. The recipe includes sliced or chopped fruit peel simmered in fruit juice and water unt… (More on Marmalade)