For years I lived with the comfortable certainty that tomato soups are not good. I don’t make tomato soups, I don’t order them in restaurants, and I know I’m not missing out. But then I was invited to a dinner party and there was this soup. How can it taste so good? How can you be so wrong? Unfortunately, I only know the answer to the first question, which is: the soup is Ottolenghi’s, and he adds a slice of sourdough bread to it, which makes it creamy and rich.