When Lorelai interrupts them kissing, Sookie and Jackson start hurriedly discussing Jackson’s plan to start making his own jams and preserves from his excess produce. Jackson tells Lorelai that he might make his own tomato sauce.
In the US, “tomato sauce” is a tomato puree seasoned with onion, garlic, bell pepper (capsicum), and herbs, which can be bought in a jar or can, or home made. It isn’t the same as the tomato sauce they call ketchup.
The Annotated Gilmore Girls 
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