My husband used to have this problem when he bought a chinese takeaway, beef something or other (apart from that we've always eaten veggie/vegan at home, which doesn't tend to interest them) and I'm afraid his solution was to shut the cat out while he was eating. So my suggestion would be to eat vegan for a while (or else put a load of pepper on top of some food to put the cat off, though that might be a bit mean).