This is a delicious Italian first course soup, as good with mussels as it is with clams. The servings are large, so adjust accordingly if desired. Time does not include preparing the clams. This is pretty much the soup I would get when I'd order it in New York family Italian restaurants. You can add a bit of clam broth if you like, but steaming the claims in the broth as is gives it a nice flavor. And in this version, the tomatoes, not paste, would be used.