Just wanted to encourage you to be confident with what you do know and not be concerned about what you lack in qualifications - I definitely think you can set yourself apart in a good way with clearly stating upfront that whilst you may not have formal qualifications - you do have skills and are really keen to learn etc.
Perhaps ring and see if you can discuss the menu/expected repertoire and make something from there/or close to take as M2R suggested. Don't forget you probably have other skills you can pull on like managing a budget, cooking seasonally, multitasking to prepare lots of meals at once, lol!
IMO being aware and realistic about your strengths and weaknesses along with a high level of motivation may be more appealing than some one who is less keen ITMS.
xxx