Coriander or cilantro is a wonderful source of dietary fiber, manganese, iron and magnesium as well. In addition, coriander leaves are rich in Vitamin C, Vitamin K and protein. They also contain small amounts of calcium, phosphorous, potassium, thiamin, niacin and carotene. Coriander is often used in Spanish, Mexican, Latin and Indian cuisine. It's a common ingredient in spice rubs, marinades, chilis, sauces, soups and curries and works well with onions, bell peppers, tomatoes and potatoes.