Hi,
Ground tuna rolls is a very typical dish from the part of Spain where I am coming from. I actually just put a recipe on my spanish blog...I will try to translate it to English when I have some time, so I can give it to you.
But this is one of the most typical recipes:
You need to chop 1 onion, 1 clove of garlic and parsley. Place it in a little bit of olive oil until it is tender.
Place the tuna in a large bowl. Add the onion, garlic and pasrley from above. Add 1 beaten egg and some bread (no crust) which you have soaked in milk first.
Season with salt and pepper.
You can them start making rolls with the pastry above. Coat them in flour and beaten egg and fry them a little bit in oil till they are golden.
In the same oil you need to make a sauce with onion, red sweet pepper, tomato, garlic and parsley. Just chopped them and cook slowly until they are soft. Add a bit of flour and then liquid to make the sauce: I use a bit of wine plus some god fish stock (or prawn stock that I make myself). I blend the sauce so there are no bites of veggies....
Finally you put all the rolls into the sauce and let them simmer for 15 minutes.