the tomato puree is what you pulse in the food processor.
I believe where the recipe says" Add tomato puree" it should have simply stated "Add the coarsely chopped tomatoes" as given in direction #1. This is what I did and this marinara came out delicious! Hope this helps to clarify.
Direction #2 says to add tomato puree. However, there is no tomato puree listed in the Ingredients list. How much are you supposed to add?