Combine mayonnaise, sour cream, lemon juice, Dijon mustard, canola oil, sugar, vinegar, horseradish, salt, celery seed, and white pepper in a a bowl, whisk to blend.
Refrigerate until cold.
Combine cabbage, red pepper, green pepper, onion, carrot, parsley, and lemon peel in large bowl. Toss with enough dressing to season to taste and serve.