The best solution is dialogue.
Explain to the girl that you can only order pizza over the phone, and not cook (even if this is not true).
Compliment her that she makes it very tasty. Most girls cook on their own and without your request, but if this is not the case in your relationship, then motivate her to cook for you.
No need to swear, this will only push her away and come up with all sorts of excuses so as not to fulfill your requests.