i think kale is most likely to be accurate, but ann hits the nail on the head, with her interpretation.
"Spelling long ago was variable but the currently preferred spelling for cabbage/broth seems to be kail and my take on this line is that he promises that she will never starve -- there will always be the makings of a basic meal -- but that he will endeavour to provide treats for her when he can (the genteel cakes suited to what he thinks her social station requires)."
jockie is probably scottish countryman, is this dialect the doric language [mid northern scots]?.