> don't have to test the banana

unless of course I called it with

abc( banana => undef, eat => 'mon' );

sub abc {
  my %param = (
    apples => 'green',
    banana => 'yellow',
    @_
  );

  # now just have to figure out the 'mon' key...
  # and the banana colour!
}
[download]

Thanks for both suggestions! doh! 8-)