Melt butter in heavy pot over medium heat. Add onion and cook for 3 minutes. Add apple and cook for 2 minutes. Add in cabbage and stir to coat. Season and add vinegar, water and brown sugar. Bring to a simmer and cover. Reduce heat to medium and cook for 15-20 minutes until cabbage is tender. Add more water if necessary. Serve hot.
Recipe Courtesy of Food Network Kitchens