It is important for those with celiac disease or a gluten intolerance to know what foods are gluten-free. How about ketchup?

Ketchup—that cheerful red sauce sold in handy glass bottles—first came on the American market in the 19th century. But its ingredients were shockingly different than they are today.

Maybe the stores are closed or you simply don't want to make ... as can -- surprise -- ketchup. Out of all the tomato-derived ingredients, ketchup is, admittedly, an unlikely replacement for ...