I love a challenge; so I went looking for the recipe you have requested.
I noticed you are in Guam, any chance you can read Japanese?
I searched the restaurant, by name, and got a hit for www.capricciosa.com
and went to it.
On the way there I was presented with a requirement for Japanese Language support to accept the connection; I responded affirmitively and got to the site.
Going down the Nav Bar I found a garlic symbol and the words "In English," so I hit that too.
I ended up at the WDI Home page (We Do It!) which had logos for 12 restaurant chains - so I went back to the www.capricciosa.com
page and selected la lista, where I found tuna, calamari and clams in tomato sauce listed under Spaghetti 1570 yen ~ 1630 yen
BUT NO RECIPE !
Under their FAQs I found:
Q. I loved the spaghetti(pasta) I had. Can you show me the recipe? (This part sound familiar Tony?)
A. Sorry- our recipes are trade secrets! Our special sauces are made using whole tomatoes imported from Italy. Since the sauce is concocted in large amounts, which is the secret of its tastiness, it will be difficult to reproduce at home
Sorry that they are so protective of their fare; but, from what you have said, and that you are looking for the recipe, It must be a good meal.
One secret I will pass on, from local Italian Restaurants, is the use of Italian Canned (tinned) Tomatoes which list the ingredients as Tomatoes, or, Tomatoes and Tomato juice. No salt, citric (whatever) ascorbic (something) or even Basil, just tomaotes with or without tomato juice. The difference is noticeable. Please, try to find some of these, then, Using the freshest of ingredients, make your own fresh pasta AND fresh Tuna, Calamari and Clams in Tomato sauce.
Best of luck, and Good Cooking,