Spinach Dumplings in Creamy Tomato Sauce

This simple dinner is simultaneously light but filling; when I first made it I went for seconds, and still felt brilliant ... until about half an hour later, when I found myself slumped in my office chair, a human dumpling, satiated but perhaps slightly too much so! The spinach dumplings are based on Italian gnudi (pronounced ‘nudey’!), which are usually made from ricotta, spinach and the scantest smudge of flour. These dumplings are not quite as light as those, but they are pretty g