@googie98: Sorry I didn’t clarify what passata was. Passata is a kind of tomato paste. It is basically sieved tomato pulp. Many supermarkets carry it. It is usually near the pasta sauces or tomato purees. It is very simple to make passata. I like to make my own.
I use about 5 pounds of tomatoes (chopped) and 10 cloves of garlic. Place them in the crockpot on high. Stir occasionally. Let it cook for about 8 hours. I leave mine out overnight. Process through a food mill, which will get rid of the skins and seeds. Then, put it back in the crockpot for another four hours. It should thicken up.