Molten chocolate cakes characteristically contain five ingredients: butter, eggs, sugar, chocolate, and flour. The butter and chocolate are melted together, while the eggs are either whisked with the sugar to form a thick paste, producing a denser pastry, or separated, with the white whipped into a meringue to provide more lift and a lighter result. A tablespoon of strong coffee is sometimes added to enhance the chocolate flavor. Vanilla extract, salt and cinnamon are additionally recommended in some cases to add extra flavor.