Coriander seeds have a warm, citrusy, and slightly nutty flavor, while coriander leaves (cilantro) offer a bright, grassy, and sometimes soapy taste. The flavor profiles are distinct and not interchangeable in most recipes.
Coriander, also known as cilantro, is a plant where both the seeds and leaves are used as culinary herbs. However, their flavors are vastly different due to different chemical compounds present in each part of the plant.
Coriander Seeds: These are the dried fruits of the coriander plant. When ground or used whole, they release a warm, aromatic flavor. The taste is often described as citrusy, with hints of lemon and a subtle nuttiness. They are commonly used in spice blends, curries, sausages, and pickling. Roasting the seeds before grinding enhances their flavor.
Coriander Leaves (Cilantro): The fresh leaves, known as cilantro, have a bright, pungent, and grassy flavor. However, a significant portion of the population (estimated between 4-14%) possesses a gene that makes cilantro taste soapy. This is due to the presence of aldehyde compounds. Cilantro is frequently used as a garnish, in salsas, salads, and Southeast Asian cuisine.
Because of these distinct flavor profiles, coriander seeds and cilantro are generally not interchangeable in recipes. Substituting one for the other will significantly alter the final taste of the dish.
If you are one of the people who perceive cilantro as soapy, try using Vietnamese coriander (rau răm) as a substitute. It has a similar appearance and usage but lacks the aldehyde compounds that cause the soapy taste.