Source: Orangette by Molly Wizenberg
Heat olive oil in a Dutch oven on the stove top over medium heat. Add onion and sauté until translucent. Add apple and sauté 2 minutes more. Add cabbage, salt and pepper to taste and a dash of apple cider vinegar. Cook over medium high heat until the cabbage is soft (about 15 minutes). Serve hot, room temperature or cold.