Coriander is the seeds from the plant that produces Cilantro leaves. The flavor of coriander blends well with that of cumin. For sweet potato fries, toss 1 TBSP ground coriander, 1 TBSP ground cumin, 2 TBSP oil and 2 large sweet potatoes, cut into strips. Bake at 350 degrees. Coriander is used in pickling and in sausage making, as well as with fish and in breads. Coriander is also an essential spice in curry powder. It has a sweet and slightly citrus flavor.