Chicken Stew - With greens

2 tablespoons olive oil 2 stalks celery , cut into bite-size pieces 1 carrot , peeled, cut into bite-size pieces 1 small onion , chopped salt & freshly ground[...]

6 cups water 2 lbs chicken (bone-in, whatever is on sale) 2 large carrots , chopped 2 large potatoes , cubed 2 stalks celery , chopped 1 medium onion ,[...]