How Ketchup And Mustard Became A Popular Pair - Chowhound

Sam Bloomberg-rissman/Getty Images Peanut butter and jelly, salt and pepper, ketchup and mustard: There are certain food pairs that are so inextricable from each other that they're often used to describe the tight bond of best friendship ("You're the ketchup to my mustard!"). But how did these two classic condiments come to be so colloquially linked? Why not, say, ketchup and relish? There's no one clear answer,…