Toss cabbage with vinegar, sugar and salt. Allow to marinate for one hour.
In large covered saucepan, sauté onion in butter until softened. Stir in cabbage and cook for a few minutes. Add 2 cups water and season with pepper. Bring to a boil.
Layer apple slices on top of the cabbage. Cover and simmer for 1 hour, checking the water level from time to time, and adding a little water if necessary. Add salt to taste before serving, if desired
Servings: