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Cook the gnocchi in a large pan of lightly salted, boiling water. Drain and reserve 200ml of the cooking water.
Heat the butter in a large frying pan. Add the gnocchi, cheese and pepper as well as 150ml of the cooking water, raise the heat a little and stir vigorously until melted and the gnocchi is well coated. Pour in more of the reserved water if you like it saucier. Season with a little salt. Transfer the gnocchi to bowls and serve with a mixed salad, if you like.