Put the pasta on to cook. Gently fry a sliced (or, if you prefer, chopped) onion in olive oil until it starts to soften. Add chopped garlic and the rinsed cima di rapa. Put a lid on the pan, turn the heat down and the leaves will cook in their own steam. When the pasta is done, add it to the vegetables with the mozarella, cut into cubes. Serve with parmesan and olive oil.
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