This warming, nourishing soup, thickened with rice, is full of soft strands of green cabbage. Parmesan is used here in two ways: The rinds are simmered in with the broth, and the cheese is grated and sprinkled on top, adding complexity and body. If you like a kick, you can increase the red-pepper flakes, or leave them out entirely for a supremely gentle broth. Add a squeeze of lemon right at the end if you like your soup on the tart side.
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