French beans are tender, slender beans with green, rounded pods, 4 to 6 inches (10 to 15 cm) long. The pods are eaten whole, including the immature seeds, when they are still young, juicy and tender. They have a delicate texture and sweet flavor. The part eaten are the pods and the seeds. The seeds of the mature pod are knows as flageolets and can be eaten and used as you would do with peas.Green beans are a fat free food that contains vitamins A and C.The beans can be white, dark brown, light brown, blotched or speckled, and black.