Seven Seas SoupCaldo de Siete MaresTwo to three times each year, Dorothy and Frank Davis, my sister and her husband, drive from their home in northern California to their second home on Mexico's Baja peninsula. They have favorite food stops along the way in Mexico, often eating Seven Seas Soup, and gave me this version from Ensenada's port-side restaurants, where it appears on most menus.The kind of fresh seafood varies according to what's available, as long as the total is seven (but who's counting?). Home cooks can make their own fish stock or use chicken broth as a base for the soup. Serve as a main dish with crusty rolls and squeeze the fresh lime juice into the soup just before eating.