Guys, if you don't know to cook and still wanted to feed your girl, express her your thoughts by practical activities but not by words. Try chopping the vegetables in inappropriate manner, attempt to put them on stove.
If the girl observes all these, she smiles inside and do you know, then she treats you as her child, comes to you and takes the responsibility of cooking. She starts teaching you how to cook and what are the ingredients to mix it up with.
Finally, more than vegetables, it is love that is cooked well in that process.