I've deleted the lettuce and onions pages, since they're very minor on their own, and all relevant info about them is already included on the Krabby Patty page.
Mayo and pickles have played important roles without just being part of another food, so they're probably significant enough to stay.
As for the others, they've survived deletion requests in the past, so they would need new deletion requests. The community's consensus on them has probably changed since. (It's interesting to note that almost all of the comments on Tomatoes are about how it shouldn't be its own page.)