5 cups thinly sliced (or shredded) green cabbage
1 cup thinly sliced (or shredded) red cabbage
1 cup peeled and coarsely grated carrot
1/2 cup coarsely chopped onion
2 tablespoons cider vinegar
2 teaspoons sugar
1/2 teaspoon salt
1/4 teaspoon pepper
1/8 teaspoon celery seed (optional)
1/3 cup sour cream
1/3 cup mayonnaise

Mix the two kinds of cabbage, carrot, and onion in a large bowl. Place the vinegar, sugar, salt, pepper, celery seed, sour cream, and mayonnaise in a smaller bowl. Blend them with a wire whisk or fork. Stir this dressing into the cabbage mixture until well mixed. Refrigerate for at least 1 hour before serving, stirring occasionally. Note: You can use 1/2 to 2/3 cup mayonnaise and eliminate the sour cream if desired.