Easy to make tomato puree by pressure cooking tomatoes. A handy jar of Tomato Puree is super helpful when making any tomato based dish. Here is how to blanch the tomatoes and then puree them. It is very easy to make homemade tomato puree. All you need are some fresh tomatoes. In fact you can use any type of tomatoes but make sure they are ripe. This tomato puree is made without any preservatives.