Cut the tomatoes into small cubes. Bring the vinegar with the sugar, salt, cinnamon, the bay leaves and the clove to the boil in a saucepan. Then add the tomatoes and tomato paste. Cook everything for about 45 minutes over low heat (it should just simmer).
When the whole thing has reduced, fish out the bay leaves and cloves, then puree everything (if necessary, season again) and stir the cornstarch in a little water, then add. Bring to the boil briefly, remove from the stove and let cool down.
Annotation:
I did not puree my ketchup, just fished out the bay leaves and the clove, for me the ketchup can have small pieces.
It`s very easy and tastes better than the ketchup you buy!