I just read 'The Man Who Ate Everything', by J. Steingarten.
The article 'Playing Ketchup' says that during the summer, ketchup is made directly from tomatoes, and from preserved tomato paste the rest of the year. He says ketchup eaters in the know can tell the difference, read labels for manufacturing dates, and stock up on late summer ketchup.
Has anyone heard this before? Does it really matter? If so, where's the good stuff?