Cinnamon sticks are hollow, dried bark rolled into a quill, with a red-brown color, and a sweet, spicy, and woody aroma and flavor. They are used whole for infusing drinks like mulled wine or cider, or in slow-cooked dishes, and can be ground into powder for baking and other recipes. They are versatile, adding warmth to both sweet and savory dishes, and can also be used for potpourri.