Zarzuela is a Spanish word for casserole.

Zarzuela refers to a colourful seafood stew/casserole that is  made of shellfish,  which is typically consist of seafoods like mussels, squid,  prawns, spiny lobster, hake and eel which are cleaned and prepared and added to a chopped mixture of onions, garlic, tomatoes and sweet peppers  and sweated in oil. The mixture is then simmered for some minutes with wine, seasoning, saffron and chopped parsley in a casserole dish and finished with stoned olives.