Most often made with oranges or a citrus medley, this marmalade is 100% lemon. We used every part of the fruit, from skin to pulp, to add not just flavour but texture, too: The fruit’s pith releases pectin while it cooks, which is what makes the preserve thicken naturally. Because the quality of lemon makes all the difference here, go with organic—just give them a good scrub before using.