Wash the fish and dab dry. Cut into cubes. Drain the seafood. Clean, wash and chop the fennel (keep fennel green.) and spring onions. Wash, clean and cut the tomatoes into eighths.
Steam fennel in hot oil for five minutes. Add spring onions, pour on broth and bring to the boil again. Add fish, seafood and tomatoes and simmer for five minutes on a low heat.
Season soup with salt, pepper and saffron. Sprinkle with chopped fennel green.