Tomato, Potato, and Beef Soup

Most people are surprised when I serve this soup and inform them that it is pure Cantonese. They always ask if Canton grows tomatoes and potatoes, and I assure them that they are indeed products of the farms there, and widely used in cooking. This is a dish for winter. Of course, winter in Canton usually means temperatures in the forties and fifties Fahrenheit, but that, I remember, was cold to us. This soup is called, in fact, “winter soup.”