My son:

Will not eat avocado...but will eat play-doh;

Will not eat any leafy green...except grass;

Will not eat green pepper...but will eat olives;

Will not eat shepherd's pie...but will eat dirt. And will pick the individual peas and corn out of the shepherd's pie to eat. Correct me if I'm wrong, but I suspect other kids pick the peas out and eat the rest;

Will not eat potato...unless in the form of a french fry (ok, no big mystery there);

Will not eat salmon...but will eat lemon. Happily sucks on a straight-up lemon slice. Husband's perspective: At least we don't have to worry about scurvy :-/