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Heat oven to 200C/180C fan/gas 6. Put the kale, walnuts, oil, lemon juice and Parmesan in a processor and blitz until the kale is very finely chopped. Bring a large pan of water to the boil and cook the gnocchi in 2 batches, for 2 mins each time.
Drain the gnocchi thoroughly, then tip into an ovenproof dish and stir through the kale pesto and the ham. Tear the mozzarella into pieces and dot over the gnocchi. Bake for 20-30 mins or until the cheese is bubbling. Serve with the salad leaves.