I like eating burgers, and have probably been a little lazy, how bad are these ingredients?

Beef (93%), Onion (4%), Rapeseed Oil, Seasoning (Sea Salt, Black Pepper, Preservative: Sodium Metabisulphite; Antioxidant: Rosemary Extract).

http://www.sainsburys.co.uk/grocerie...=1342788297293

Am I way off paleo here?