Ah, well that sounds like a larger expansion than you might think. Items in general aren't something I've had success playing with yet. I know it can be done, but I'd have to figure that out before I could do something like this. Also, I haven't dug into the farm code at all, and I'd rather not try adjusting it until Aric has got it how he likes it.
A Chef job, might be doable... I've been thinking some new jobs might be nice too. Adding an overall food quality could be done - maybe make a luxury bonus possible. Energy already recovers each turn and you can pay for a daily dose of aphrodisiac in their food already.