Take lettuce for example.
If you put a lot of lettuce in a bowl.. What do you have? A Salad?
NO. You have a bowl of lettuce.
You put a second object in the lettuce bowl (Crouton, dressing, another veg, whatever), Now do you have a Salad?
Yes. You have a salad.
There is no maximum ingredient count for a salad, but you must have a minimum of two items for a salad.