Chop cabbage, celery, onion, carrots, and peppers (if using) to desired size.

In a large bowl, combine the chopped vegetables.

Add oil, salt, and celery seed to the vegetables and mix well.

In a separate bowl, whisk together sugar, water, and vinegar until the sugar is dissolved.

Pour the sugar-vinegar mixture over the vegetables.

Mix thoroughly to ensure all vegetables are coated with the dressing.

Refrigerate for at least 5 minutes before serving to allow flavors to meld.

Store leftovers in the refrigerator for up to a week.