Braised Red Cabbage with Apple and Onion

INGREDIENTS

• 1 tablespoon butter
• 1 medium onion, halved and thinly sliced
• 1 Gala or Fuji apple, halved, cored, and sliced
• 1 head red cabbage (2 pounds), cored, quartered, and thinly sliced
• Coarse salt and ground pepper
• 3 tablespoons cider vinegar
• 4 teaspoons sugar
• 1/2 cup water