The nightshade family of plants include tomatoes, potatoes, and
eggplants. Depending on the salad in question, and of those could
be in it. If you are referring to just a side salad with lettuces
and the like, then the answer is plain old tomatoes.
The #1 herb that flatters tomato is basil, and tomatoes also get
along beautifully with any member of the allium family (onions,
garlic, chives, shallot). Salt enhances their flavor if you don't
overdo it. Cilantro is also very good with tomatoes.
because scientist have studied them and found out that they are
actually in the fruit family
(new answer) Apperently, all fruits are supposed to have seeds.
As tomatoes have seeds in it it is considered a fruit, just like