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Well, thanks to a combination of all your suggestions, we had the most amazing meal tonight.
Shredded the cabbage, fried it in butter then added a splash of cider vinegar, put the lid on and turned heat off. In another pan, fried an onion and some leftover cooked potato, added that to cabbage. Found some leftover Christmas ham in freezer, cubed it and threw that in too.
Half a pot of leftover elmlea had two teaspoons of Dijon mustard stirred into it before adding it to the pan.
Scrumptious doesn’t do it justice. Thanks everyone :)