With the right ingredients, you can make green ketchup. If you were a kid in the early 2000s, then, no not that vivid ketchup that came in alarming, electric shades of green, purple and turquoise.

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This story appears in the February 2019 issue of National Geographic magazine. Ketchup—that cheerful red sauce sold in handy glass bottles—first came on the American market in the 19th century.