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Finely shred the cabbage – the quickest way to do this is in a food processor with a shredder attachment or using a mandoline.
Heat the oil in a wok or large frying pan, then add the cabbage and kale. Stir-fry over a high heat for 3-4 mins or until the cabbage starts to wilt, then add the rest of the ingredients. Toss everything together really well, continue to cook for a further 4 mins and season before serving. Keep warm in a low oven if needed or leave to cool, cover, chill and reheat in a pan or microwave the following day.