Easy to make with convenient, packaged coleslaw, in this version the creamy dressing with vinegar, sugar and vegetable oil is close to what's served at popular fried chicken, burger and fish restaurants.
Combine the coleslaw mix and onion in a large bowl.
Whisk together the salad dressing, vegetable oil, sugar, vinegar, salt, and celery seeds in a medium bowl; blend thoroughly. Pour dressing mixture over coleslaw mix and toss to coat. Chill at least 2 hours before serving.