The first video presented is our own Simple Recipe to Make
Tomato Sauce. From this method, all you need to do to make
a thick ketchup is boil this tomato sauce down some more until it
is thicker.
This method is super simple and comes from my Romanian mother-in-law,
where they have been doing it this way for decades. I like this
method because it cooks in a lot of the flavor that a processor
wouldn't catch. It's easy to pulverize a tomato down to juice, but
this method simmers and cooks in the natural tomato flavors.