Although it is often classified as a grain, quinoa is actually a member of the same plant family as spinach. While the green leafy tops are edible, it's the seeds that are served most frequently. For more than 5,000 years, quinoa has been the staple food of peoples of the Andes, where it is one of the few crops that grows well in the dry, mountainous climate and poor soil. Here are some tips to help you add this incredibly healthy grain to your meals.