Fish will cook if you marinate it for more than 20 minutes.
The good news is that cod, like other white fish, is a great base for lots of flavours. You can put pesto or salsa on it and broil it in the oven. A mix of dry herbs (thyme, basil, oregano) with lemon juice and garlic is also nice.
Check this out for something different!!! I made it the other night and LOVED it. Go easy on the soy sauce or it gets really salty. Otherwise, to die for.
cod can stand up to a lot of different cooking methods. one of my faves is to saute the cod in olive oil for only a couple of minutes (seasoned with s&p) and then remove from the pan. then saute shallots, garlic, and red peppers. next add some canned tomatoes, kalamata olives and capers and add the cod back in with a couple of thin slices of lemon. you can simmer it FOREVER and the cod doesn't get disgustingly overcooked like most fish
sesame oil, sesame seeds, vinegar, sugar and soy sauce
My grandmother's recipe - poach cod in tomatoes, peppers and onions. Saute the onions and peppers, add canned, diced tomatoes, season well with fresh herbs (basil, oregano, parsley, garlic). Bring to a simmer in a large saute pan. Place the fish in the pan and spoon tomatoes over. Cover and simmer about 15 minutes or until the fish is done (don't overcook.)