Salad notation is a notation that is intended to express salad numbers, and is not intended to be a serious function. Thus it is ill-defined.
Salad(n) outputs a random number within section (n+1) in Googology Wiki's "list of googolisms" page which fits its bounds. Thus:
the value of Salad(n) for 21 ≤ n ≤ 1337 is always uncomputable.
the value of Salad(n) for n ≤ 1337 always outputs a number related to fictional googology.
Specific values:
Salad(0) = - 0.1234567891011121314151617181920...
Salad(69) = Croutonillion
Salad(420) = Sam's Number
Salad(512) = Aleph-naught
Salad(862) = Indescribable cardinal
Salad(1337) = "Absolute infinity"