Pulse tomatoes and juices in a food processor until coarsely chopped.
Heat garlic and oil in a 5-quart pot over medium heat until garlic begins to sizzle, about 2 minutes. Add tomato puree, salt, and pepper, and bring to a boil. Reduce heat, and simmer, partially covered, stirring occasionally, for 30 minutes. Let cool slightly. Sauce can be refrigerated, covered, for up to 3 days.
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?