My girlie will only eat biscuits but recently she ate a pouch of beef in gravy (have tried every variety since!) but now only licks the gravy off too.
She likes these ones the best
Purina One Cat Natural Balance Pouch Beef 85g product information - Tesco.com
Not the greatest nutritional value but it's a start.
Also I think you can buy gravy for cats in bottles like you do milk. I'm sure I saw it at pets at home but can't find it on their website, may be worth looking up.