steamed dungeness crab, cleaned and cracked • small mussels, scrubbed and debearded • small clams, scrubbed • medium shrimp in the shell, deveined • bag scallops, defrosted • calamari, cut into 1" bands • whole filet of halibut or other firm-flesh fish • olive oil, extra virgin • small onion, halved and cut in thirds • garlic cloves, crushed • small red bell pepper, cut in 2-inch strips • a fennel bulb, cut in thirds •