Split cassia, also known as split cinnamon or cassia quills, is a spice derived from the bark of the cassia tree (Cinnamomum cassia). It is similar in flavor and appearance to true cinnamon but is typically more robust and slightly spicier. Split cassia is created by carefully peeling the bark from cassia tree branches, which naturally curl as they dry, forming quills or rolls. These rolls of cassia bark are then split lengthwise into thinner strips. This spice is commonly used in various culinary applications, including baking, cooking, and brewing, to add a warm, sweet, and aromatic flavor to dishes, desserts, and beverages. Split cassia is especially prevalent in Asian and Middle Eastern cuisines and is appreciated for its versatility in both savory and sweet recipes.