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Amazon.com : Heinz Tomato Ketchup, 0.32-Ounce Single Serve Packages (Pack of 200) : Heinz Ketchup Portion Packets : Grocery & Gourmet Food
Which? on Twitter: "@MarshaNJon Ketchup has vinegar in it, plus tomatoes are naturally acidic, so there's no need to store it in the fridge - despite what the bottle says. Although, if
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