Slice the onion into strips and chop the garlic, meanwhile heating the EVOO over medium heat in a skillet or wok. Chop the chard stalks, much like you would a stalk of celery (they look and feel the same). Once the oil is heated, add the garlic and sauté for a couple of minutes. Add the onion and chard stalk, stirring every minute or so. Allow these to cook for 4-5 minutes, or until the onion is translucent and chard is softened.