What is your spaghetti policy here. Better Boy The picture at right shows the best variety of tomato to use: There's generally no need to add liquid, most types of tomatoes have so much water, we will need to boil it down to drive off much of the water to thicken the sauce. The spaghetti sauce mix see the Amazon. And if you don't have enough, a pick-your-own farm is the pace to go! Toggle navigation PYO. Here's a trick you may not know: Yes, it is called SPAM. Pressure canners work better for tomatoes and other low acid foods - you'll get less spoilage with a pressure canner.