Christina's Cole Slaw

adapted from Bobby Flay

1 large head green cabbage, finely shredded
2 large carrots, finely shredded
1/2 cup best-quality mayonnaise
2 tablespoons sour cream
2 tablespoons grated onion
2 tablespoons sugar, or to taste
2 tablespoons white or red wine or apple cider vinegar
1 tablespoon dry or prepared Dijon mustard
2 teaspoons celery salt
Salt and freshly ground pepper

Combine the shredded cabbage and carrots in a large bowl. Whisk together the mayonnaise, sour cream, onion, sugar, vinegar, mustard, celery salt, salt, and pepper in a medium bowl, and then add to the cabbage mixture. Mix well to combine and taste for seasoning; add more salt, pepper, or sugar if desired.