It's a battle of red and yellow! A condiment thunderdome! A sauce showdown! ...you get the picture. It's time for ketchup and mustard.Research Links:Sources:History — The Surprisingly Ancient History of KetchupMental Floss — From Inedible to Indispensable: When a Quack Doctor Touted Tomatoes as a Medical Cure-AllLet’s Talk Science ­— Why Is Ketchup So Hard to Pour?Sources:Alimentarium — Mustard As a CondimentA Measured Life — Hello Again! Plus The Science of MustardMental Floss (YouTube) — Food History: Ketchup and Mustard

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