Ruby Slaw

Ingredients

• 1 medium head red cabbage (about 1-1/2 pounds)
• 1 medium head green cabbage (about 1-1/2 pounds)
• 5 tablespoons white vinegar, divided
• 1 medium onion, chopped
• 2 medium red apples, chopped
• 2 tablespoons brown sugar
• 1 tablespoon Dijon mustard
• 1/2 cup sour cream
• 1/2 cup mayonnaise
• 2 tablespoons crumbled blue cheese
• 1 tablespoon minced chives
• 1 tablespoon chopped fresh parsley or 1 teaspoon dried parsley flakes
• 1/2 teaspoon salt
• 1/2 teaspoon pepper