Since your girlfriend is just learning, I'd say to humor her by finding some simple recipes that she could start with. As she gets more comfortable, she'll be willing to improvise and will take on some of your style.
How about deciding on a meal that you'd like to cook together, find some easy recipes and follow them together. It'll be a nice way to spend an evening. Plus, it never hurts for someone with a cooking style like yours to force yourself to follow a recipe--it's a good challenge!
If she's really serious about learning more and you want to get her a little somethign, I'd suggest The Kitchen Survival Guide by Laura Brody. http://www.amazon.com/exec/obidos/tg...books&n=507846
I bought myself a copy when I moved into my first apartment in college. A woman who shopped at the book store I worked in at the time said she got it as a gift for anyone she could who were just starting on their own. It goes over basic cooking skills, how to grocery shop and includes a ton of really good, simple and easy to follow recipes. I give that book a lot of credit for helping develop my love of cooking!