From the Olive Garden Website
Creamy marinara sauce with mozzarella, parmesan, romano, riccotta and fontina
I haven't seen fonita cheese in my grocery store and have substituted povolone.
The best I can say is that the sauce is the same as the one used in the Five Cheese Ziti al Forno recipe.
That is posted on this site, do a search.
But, the five cheese marinara has chunks of tomatoes in it, and the ziti sauce does not.
Here is the recipe:
4 Cups tomato sauce
2 Cups Alfredo sauce
1/2 Cup ricotta cheese
1 Teaspoon garlic pepper
1/2 Teaspoon garlic powder
1/4 Cup mozzarella cheese, shredded
3 Tablespoons fontina cheese, shredded
Use the marina sauce if you want chunks of tomato.