Perhaps truly the most nutritious vegetable you can consume (as cartoon character Pop-Eye would like you to believe), spinach forms in soft green leaves with bendy green stems. Beware when cooking as it is very delicate. It exudes water and juices of its own, so be mindful when boiling. Spinach is high in iron, calcium, Vitamin A, and Vitamin C. In order to properly absorb all of the nutrients in Spinach, some great compliments are foods high in vitamin C such as oranges or tomatoes.