This is a delicious way to eat your greens – and definitely worth seeking out some sumac which adds such a great tang. Recipe is from Diana Henry’s book A change of appetite – where healthy meets delicious. It works fine if you only have savoy cabbage and not cavolo/kale as well – just bump up the cabbage quantity. And if you love crispy fried onions, it’s worth doubling them. To switch up from side dish to main (alongside some mash or rice), try adding some cooked lentils at the end of step 4.