Alida's Alpine Inn Coleslaw

1 pound cabbage, shredded
1 small carrot, shredded
1 tablespoon minced onion
1/2 teaspoon salt
1 1/2 teaspoons sugar
1/2 teaspoon black pepper
1/2 teaspoon prepared horseradish
1/2 teaspoon celery salt
1 1/4 cups mayonnaise-style salad dressing

Combine ingredients in bowl in order given. Mix until well blended. Makes 4 servings.