They'll nibble at onions, garlic and leeks until spring is well and truly under way, but ignore them through the summer. Potatoes, tomatoes, squashes, cucumbers, artichokes, broad beans and things along that sort of line are fairly trouble free with rabbits ... they will nibble off the young tips of emerging runner and french beans - but if you can protect them to above rabbit height before they climb up the poles they normally ignore them then.
Lettuce, Chard, Beetroot, Carrots, all brassicas and peas are all out until you've got them clear ... alternatively you can grow these in well netted temporary tunnels made from water piping hoops on bamboo and they will be pretty safe as long as the nets stay in place. Ooh and parsley, celery, fennel and coriander are their absolute favourites so don't bother with those either!