Tomatoes: one plant, two opposite answers
Tomato is the food on this list where the detail matters most, because the plant contains both a safe treat and a genuine hazard. The ripe, red flesh of a tomato is fine for a rabbit in small amounts — juicy, mildly sweet, and interesting in a way that makes it a useful occasional treat. Everything green on the same plant is a different story. Tomato leaves, stems and unripe green fruit carry solanine-family compounds that are harmful to rabbits, and those parts should never be fed, offered as garden forage, or left where a rabbit can help itself. The rule that keeps a rabbit safe around tomatoes is therefore absolute and simple: ripe and red, yes, in treat quantities; green in any form, never.
Serving the ripe fruit safely
Choose a tomato that is fully ripe and red all over — no green shoulders, no pale patches. Wash it, pull off the stem and any trace of the green calyx at the top, and serve a modest piece: half a cherry tomato, or a small wedge of a larger fruit, is a sensible serving for an average adult rabbit, roughly once a week. Tomato is acidic as well as sugary, and a generous serving can soften droppings in a rabbit whose gut is not accustomed to fruit, so start small with a tomato novice and check the next day's output. Juice, seeds and skin in that small piece are all fine — there is no need to deseed or peel a rabbit's portion. Tomatoes that are split, mouldy or fermenting go to the compost, and cooked tomato in sauces is out entirely, since it arrives with salt, oil and seasoning.
Protecting rabbits from the plant itself
The bigger tomato risk is not the fruit bowl, it is the garden. A free-roaming rabbit in a vegetable garden will sample what it can reach, and tomato foliage is within hopping distance of the ground for much of the season. Fence tomato plants away from areas where rabbits roam, or grow them in raised beds and containers a rabbit cannot climb into, and never throw tomato prunings or pulled-up plants into the rabbit's run as greenery — a common and well-meaning mistake. The same caution covers the wider family: potato leaves and other nightshade foliage deserve the same keep-away treatment. If you ever suspect a rabbit has eaten a quantity of tomato leaves or green fruit, do not wait for symptoms to decide for you; call your vet straight away and say what was eaten and roughly how much.
A rule worth writing where helpers can see it
Tomato is exactly the kind of food where a substitute feeder can go wrong with the best intentions — the fruit is in the bowl, the leaves are in the garden, and the distinction between them is not obvious to someone who does not keep rabbits. Writing the rule down removes the guesswork: in KinsLe's Care Teams, the feeding notes on your rabbit's profile can state plainly that ripe tomato flesh is an occasional treat and every green part of the plant is forbidden, so anyone who feeds your rabbit follows the same rule you do.