While it is possible to dice them for canning, they will become very mushy in consistency during the cooking process. It does enable more to be fitted into the jar if the final consistency isn't a problem.
Try this. Par boil them until the skin splits and remove from heat. Remove the skin and quarter them. This helps to see any bad spots that may be hidden inside the tomato. I used to can in mason jars but now I pour the tomatos into a quart size ziplock bag and freeze them flat. They freeze fast and take only minutes to thaw in warm water.
It would be healthier to dice tomatoes of your own instead of tomato paste. Tomato paste is made with different substances that you don't always know what's inside of it.
Depending on where you live it might be better to buy Italian canned diced tomatoes. In some climates tomatoes don't have the richness of the Italian-grown product. Look for labels which show 99% tomato content (there may also be a little salt) with no added water, juice or other additives.
Tomato paste should be labelled as 99% or 100% tomatoes, and shouldn't contain any additives.
In both cases, if additives are listed, don't buy the product no matter how cheap it is.
Depnding whether or not you prefer a more paste like texture than the chunky texture of diced tomatos then you may.
Stewed tomatoes have more juice and bits of tomato that aren't in the paste. It would change the moisture content and the texture of the dish. I don't think it would work out.
You could use tomato sauce, tomato paste with added liquid, or crushed tomatoes.
The ingredients are: tomato puree (water and tomato paste), diced tomatoes in tomato juice, jalapeno peppers, onions, vinegar, salt, garlic powder, and natural flavor. The only ingredient that may be questionable is the "natural flavor." You would have to ask the manufacturer if the "natural flavor" is vegan.
Tomatoes are acidic (pH of 4-4.6)
pesto
Tomatoes are grown in the Baja region of Mexico and Sinaloa. Sinaloa is where much of the tomato paste production is located.
If you are cooking with them, you can use canned tomatoes. If you are using them in salads, or on sandwiches, etc., then there really is no substitute for a raw tomato.
Tomato sauce is cooked to allow the liquid in the tomatoes to reduce which creates the sauce or paste. Tomato ketchup is cooked tomatoes with added ingredients such as vinegar, sugar, salt, and other spices.
To cook your fresh tomatoes into a sauce or a paste, chop and blend them. Cook in a wide pan on medium low until the tomatoes have reduced to a sauce or paste according to your liking stirring constantly Season with salt and a bit of sugar if necessary. Careful to not burn.
Yes, depending on the dish. If you are making lasagne for example, you can substitute with just tomato paste. You might want to add more onion and herbs for flavour. If you were going to substitute paste for tomatoes that are displayed on the dish, then I'd make something else !
it takes about 3 cups of tomato paste to make one pound. I hope that helps everyone make beautiful flower arangments :) It depends on the water content of the tomatoes .. fewer cups with fresh tomatoes, and more with dried tomatoes, but about 3 - 3 1/2 cups of tomato paste.