I do a similar version but asian inspired, and I use julienned carrot, spring onion, ginger and garlic and a splosh of soy and some sesame oil. I also use a piece of parchment (baking paper) in between the foil and fish because cooking on straight Aluminium is said in some circles to not be good for you and it doesn't stick. Otherwise Leeks, Slice Lemon, Garlic and Dill are also good parcel ingredients. With a splosh of white wine and some dots of butter.