1/2 head green cabbage, thinly sliced
1/2 head red cabbage, thinly sliced
1 carrot, thinly sliced
1/2 cup buttermilk
2 fluid ounces plain yogurt
2 fluid ounces mayonnaise
1 tablespoon pickle juice
1 teaspoon dry mustard
1 tablespoon chives, chopped
Kosher salt, as needed
1/2 teaspoon fresh ground black pepper